Lord Abbett Developing Growth Fund Class R6 (LADVX) NPORT-P Lord Abbett Developing Growth Fund Inc (Oct 2021 report)

Lord Abbett
Quarterly Portfolio Holdings Report

Lord Abbett
Developing Growth Fund

For the period ended October 31, 2021

Schedule of Investments (unaudited)

October 31, 2021

Investments	Shares		Fair Value (000)
LONG-TERM INVESTMENTS 99.79%
COMMON STOCKS 99.79%
Aerospace & Defense 2.69%
Axon Enterprise, Inc.*		562,308	$	101,193
CAE, Inc. (Canada)*(a)		1,144,880		34,770
Total				135,963
Auto Components 1.86%
Fox Factory Holding Corp.*		388,138		62,471
Gentherm, Inc.*		428,735		31,568
Total				94,039
Banks 2.59%
Silvergate Capital Corp. Class A*		451,113		70,653
Western Alliance Bancorp		517,624		60,091
Total				130,744
Beverages 1.73%
Celsius Holdings, Inc.*		687,410		66,349
Duckhorn Portfolio, Inc. (The)*		1,088,547		21,052
Total				87,401
Biotechnology 13.85%
ALX Oncology Holdings, Inc.*		494,209		27,696
Arena Pharmaceuticals, Inc.*		395,393		22,692
Biohaven Pharmaceutical Holding Co. Ltd.*		340,543		48,466
Blueprint Medicines Corp.*		484,435		54,494
Bridgebio Pharma, Inc.*		706,258		34,875
CareDx, Inc.*		537,452		27,410
Cerevel Therapeutics Holdings, Inc.*(b)		628,604		25,553
Curis, Inc.*		2,127,856		13,831
Intellia Therapeutics, Inc.*		444,407		59,097
Karuna Therapeutics, Inc.*		193,760		27,200
Krystal Biotech, Inc.*		689,547		34,540
Mirati Therapeutics, Inc.*		384,068		72,597
Natera, Inc.*		743,870		85,225

Investments	Shares		Fair Value (000)
Biotechnology (continued)
Rocket Pharmaceuticals, Inc.*		683,951	$	20,320
Sarepta Therapeutics, Inc.*		251,764		19,922
SpringWorks Therapeutics, Inc.*		274,902		18,435
TG Therapeutics, Inc.*		990,531		30,924
Turning Point Therapeutics, Inc.*		333,269		13,857
Ultragenyx Pharmaceutical, Inc.*		385,419		32,344
Xenon Pharmaceuticals, Inc. (Canada)*(a)		982,271		30,598
Total				700,076
Building Products 1.76%
AZEK Co., Inc. (The)*		1,373,869		50,407
Trex Co., Inc.*		363,064		38,630
Total				89,037
Capital Markets 1.86%
Evercore, Inc. Class A		498,286		75,660
Open Lending Corp. Class A*		589,846		18,592
Total				94,252
Chemicals 2.16%
Balchem Corp.		341,272		52,245
Livent Corp.*		2,012,585		56,795
Total				109,040
Communications Equipment 2.18%
Calix, Inc.*		1,762,674		110,326
Construction & Engineering 0.37%
Ameresco, Inc. Class A*		226,580		18,609
Construction Materials 0.95%
Eagle Materials, Inc.		322,771		47,886
Diversified Consumer Services 0.23%
Duolingo, Inc.*(b)		66,158		11,491
Electronic Equipment, Instruments & Components 1.16%
Littelfuse, Inc.		200,065		58,929

See Notes to Schedule of Investments. 1

Schedule of Investments (unaudited)(continued)

October 31, 2021

Investments	Shares		Fair Value (000)
Energy Equipment & Services 0.22%
MELI Kaszek Pioneer Corp. Class A*		895,435	$	11,238
Health Care Equipment & Supplies 7.82%
Axonics, Inc.*		1,211,215		88,843
Figs, Inc. Class A*(b)		1,059,041		35,594
Inmode Ltd. (Israel)*(a)		1,194,417		113,159
Ortho Clinical Diagnostics Holdings plc*		1,148,499		22,706
Shockwave Medical, Inc.*		446,320		95,379
Tandem Diabetes Care, Inc.*		292,901		39,931
Total				395,612
Health Care Technology 2.57%
Inspire Medical Systems, Inc.*		323,843		87,302
Phreesia, Inc.*		605,364		42,702
Total				130,004
Hotels, Restaurants & Leisure 1.94%
Marriott Vacations Worldwide Corp.		327,368		51,469
Papa John’s International, Inc.		375,678		46,614
Total				98,083
Household Durables 4.03%
LGI Homes, Inc.*		340,551		50,844
Sonos, Inc.*		1,565,018		51,051
Tempur Sealy International, Inc.		1,841,456		81,889
Traeger, Inc.*(b)		1,049,317		19,822
Total				203,606
Information Technology Services 6.82%
BigCommerce Holdings, Inc.*		250,404		11,571
DigitalOcean Holdings, Inc.*		494,108		48,220
Endava plc ADR*		645,537		102,292
Flywire Corp.*(b)		531,121		25,196
Globant SA (Uruguay)*(a)		226,563		72,317
Shift4 Payments, Inc. Class A*		695,159		43,886
TaskUS, Inc. Class A*(b)		714,945		41,395
Total				344,877

Investments	Shares		Fair Value (000)
Insurance 0.83%
Goosehead Insurance, Inc. Class A		290,942	$	41,983
Interactive Media & Services 3.19%
Bumble, Inc. Class A*(b)		1,588,231		83,414
Eventbrite, Inc. Class A*		1,644,853		33,292
ZipRecruiter, Inc. Class A*		1,598,712		44,412
Total				161,118
Leisure Products 2.16%
Callaway Golf Co.*		1,308,384		35,392
YETI Holdings, Inc.*		752,181		73,962
Total				109,354
Life Sciences Tools & Services 0.38%
Quanterix Corp.*		385,279		19,499
Machinery 4.88%
Altra Industrial Motion Corp.		609,878		31,805
Chart Industries, Inc.*		441,518		78,378
Evoqua Water Technologies Corp.*		1,251,163		52,336
Kornit Digital Ltd. (Israel)*(a)		257,378		43,054
RBC Bearings, Inc.*		175,914		41,152
Total				246,725
Media 0.37%
Integral Ad Science Holding Corp.*		755,182		18,555
Personal Products 1.05%
Beauty Health Co. (The)*(b)		1,938,051		53,238
Pharmaceuticals 1.22%
Intra-Cellular Therapies, Inc.*		1,430,414		61,608
Professional Services 1.96%
Insperity, Inc.		390,247		48,781
Upwork, Inc.*		1,067,455		50,298
Total				99,079

2 See Notes to Schedule of Investments.

Schedule of Investments (unaudited)(continued)

October 31, 2021

Investments	Shares		Fair Value (000)
Semiconductors & Semiconductor Equipment 9.66%
Ambarella, Inc.*	408,496	$	75,911
Brooks Automation, Inc.	606,541		70,632
CEVA, Inc.*	516,218		23,545
Diodes, Inc.*	941,201		90,440
MKS Instruments, Inc.	255,242		38,299
Semtech Corp.*	1,129,948		96,079
Silicon Motion Technology Corp. ADR	603,742		43,113
SiTime Corp.*	190,354		50,423
Total			488,442
Software 9.62%
Appian Corp.*(b)	222,332		22,102
Asana, Inc. Class A*	325,861		44,252
Clear Secure, Inc. Class A*(b)	476,750		21,306
Everbridge, Inc.*	393,191		62,639
Jamf Holding Corp.*	1,409,925		67,183
Lightspeed Commerce, Inc. (Canada)*(a)	380,605		37,181
Olo Inc. Class A*	686,250		18,680
Rapid7, Inc.*	693,662		89,309
Riskified Ltd. Class A (Israel)*(a)	926,069		17,910
Sprinklr, Inc. Class A*(b)	854,938		16,501
Sprout Social, Inc. Class A*	698,850		89,229
Total			486,292
Specialty Retail 3.72%
Boot Barn Holdings, Inc.*	287,944		30,087
National Vision Holdings, Inc.*	1,206,051		74,341
Petco Health & Wellness Co., Inc.*(b)	1,350,593		33,400
RH*	76,612		50,536
Total			188,364
Textiles, Apparel & Luxury Goods 2.69%
Crocs, Inc.*	841,791		135,907

Investments	Shares		Fair Value (000)
Trading Companies & Distributors 1.27%
Rush Enterprises, Inc. Class A		1,233,744	$	64,253
Total Common Stocks (cost $3,630,538,626)				5,045,630
	Principal Amount (000)
SHORT-TERM INVESTMENTS 3.05%
Repurchase Agreements 0.38%
Repurchase Agreement dated 10/29/2021, 0.00% due 11/1/2021 with Fixed Income Clearing Corp. collateralized by $20,675,600 of U.S. Treasury Note at .50% due 10/31/2027; value: $19,729,295; proceeds: $19,342,444 (cost $19,342,444)	$	19,342		19,342
	Shares
Money Market Funds 2.40%
Fidelity Government Portfolio(c) (cost $121,361,390)		121,361,390		121,361
Time Deposits 0.27%
CitiBank N.A.(c) (cost $13,484,599)		13,484,599		13,485
Total Short-Term Investments (cost $154,188,433)				154,188
Total Investments in Securities 102.84% (cost $3,784,727,059)				5,199,818
Other Assets and Liabilities – Net (2.84)%				(143,556	)
Net Assets 100.00%			$	5,056,262

ADR	American Depositary Receipt.
*	Non-income producing security.
(a)	Foreign security traded in U.S. dollars.
(b)	All or a portion of this security is temporarily on loan to unaffiliated broker/dealers.
(c)	Security was purchased with the cash collateral from loaned securities.

See Notes to Schedule of Investments. 3

Schedule of Investments (unaudited)(concluded)

October 31, 2021

The following is a summary of the inputs used as of October 31, 2021 in valuing the Fund’s investments carried at fair value⁽¹⁾:

Investment Type(2)	Level 1 (000)		Level 2 (000)		Level 3 (000)		Total (000)
Long-Term Investments
Common Stocks	$	5,045,630	$	–	$	–	$	5,045,630
Short-Term Investments
Repurchase Agreements		–		19,342		–		19,342
Money Market Funds		121,361		–		–		121,361
Time Deposits		–		13,485		–		13,485
Total	$	5,166,991	$	32,827	$	–	$	5,199,818

(1)	Refer to Note 2(b) for a description of fair value measurements and the three-tier hierarchy of inputs.
(2)	See Schedule of Investments for fair values in each industry and identification of foreign issuers and/or geography. When applicable each Level 3 security is identified on the Schedule of Investments along with the valuation technique utilized.
	A reconciliation of Level 3 investments is presented when the Fund has a material amount of Level 3 investments at the beginning or end of the period in relation to the Fund’s net assets.

4 See Notes to Schedule of Investments.

Notes to Schedule of Investments (unaudited)

1. ORGANIZATION  

Lord Abbett Developing Growth Fund, Inc. (the “Fund”) is registered under the Investment Company Act of 1940, as amended (the “Act”), as a diversified, open-end management investment company. The Fund was incorporated under Maryland law on August 21, 1978. The Fund’s predecessor corporation was organized on July 11, 1973.

The Fund’s investment objective is long-term growth of capital through a diversified and actively managed portfolio consisting of developing growth companies, many of which are traded over the counter.

2. SIGNIFICANT ACCOUNTING POLICIES  

(a)	Investment Valuation-Under procedures approved by the Fund’s Board of Directors (the “Board”), Lord, Abbett & Co. LLC (“Lord Abbett”), the Fund’s investment manager, has formed a Pricing Committee to administer the pricing and valuation of portfolio investments and to ensure that prices utilized reasonably reflect fair value. Among other things, these procedures allow the Fund to utilize independent pricing services, quotations from securities and financial instrument dealers and other market sources to determine fair value.
	Securities actively traded on any recognized U.S. or non-U.S. exchange or on The NASDAQ Stock Market LLC are valued at the last sale price or official closing price on the exchange or system on which they are principally traded. Events occurring after the close of trading on non-U.S. exchanges may result in adjustments to the valuation of foreign securities to reflect their fair value as of the close of regular trading on the New York Stock Exchange LLC. The Fund may rely on an independent fair valuation service in adjusting the valuations of foreign securities. Unlisted equity securities are valued at the last quoted sale price or, if no sale price is available, at the mean between the most recently quoted bid and asked prices.
	Securities for which prices are not readily available are valued at fair value as determined by the Pricing Committee and approved in by the Board. The Pricing Committee considers a number of factors, including observable and unobservable inputs, when arriving at fair value. The Pricing Committee may use related or comparable assets or liabilities, recent transactions, market multiples, book values and other relevant information to determine fair value of portfolio investments. The Board convenes on a regular basis to review fair value determinations made by the Pricing Committee pursuant to the procedures and employs techniques such as reviews of any related market activity, transactional back-testing disposition analysis and regular review of inputs and assumptions.
	Investments in open-end money market mutual funds are valued at their NAV as of the close of each business day. Short-term securities with 60 days or less remaining to maturity are valued using the amortized cost method, which approximates fair value.
(b)	Fair Value Measurements-Fair value is defined as the price that the Fund would receive upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market of the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Inputs refer broadly to the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk - for example, the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and/or the

5

Notes to Schedule of Investments (unaudited)(continued)

risk inherent in the inputs to the valuation technique. Inputs may be observable or unobservable. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The three-tier hierarchy classification is determined based on the lowest level of inputs that is significant to the fair value measurement, and is summarized in the three broad Levels listed below:

•	Level 1 –	unadjusted quoted prices in active markets for identical investments;
•	Level 2 –	other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.); and
•	Level 3 –	significant unobservable inputs (including the Fund’s own assumptions in determining the fair value of investments).

A summary of inputs used in valuing the Fund’s investments as of October 31, 2021 and, if applicable, Level 3 rollforwards for the period then ended is included in the Fund’s Schedule of Investments.

Changes in valuation techniques may result in transfers into or out of an assigned level within the three-tier hierarchy. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

3. FEDERAL TAX INFORMATION  

It is the policy of the Fund to meet the requirements of Subchapter M of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all taxable income and capital gains to its shareholders. Therefore, no income tax provision is required.

Each Fund files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The statute of limitations on the Fund’s filed U.S. federal tax returns remains open generally three years after the filing of the tax return. The statutes of limitations on the Fund’s, state and local tax returns may remain open for an additional year depending upon the jurisdiction.

4. SECURITIES LENDING AGREEMENT  

The Fund has established a securities lending agreement with Citibank, N.A. (the “agent”) for the lending of securities to qualified brokers in exchange for securities or cash collateral equal to at least the market value of securities loaned, plus interest, if applicable. Cash collateral is invested in an approved money market fund. In accordance with the Fund’s securities lending agreement, the market value of securities on loan is determined each day at the close of business and any additional collateral required to cover the value of securities on loan is delivered to the Fund on the next business day. As with other extensions of credit, the Fund may experience a delay in the recovery of its securities or incur a loss should the borrower of the securities breach its agreement with the Fund or has become insolvent at a time when the collateral is insufficient to cover the cost of repurchasing securities on loan.

6

Notes to Schedule of Investments (unaudited)(concluded)

As of October 31, 2021, the market value of securities loaned and collateral received for the Fund was as follows:

Market Value of Securities Loaned	Collateral Received
132,878,825	134,845,989

7

QPHR-DEV-1Q

(10/21)