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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+8.44%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$173B
AUM Growth
+$16.7B
Cap. Flow
-$1.31B
Cap. Flow %
-0.76%
Top 10 Hldgs %
46.92%
Holding
10,366
New
1,549
Increased
3,675
Reduced
3,484
Closed
1,506

Top Buys

Rank Stock Value
1
PFE icon
Pfizer
PFE
+$89.5M
2
XLE icon
State Street Energy Select Sector SPDR ETF
XLE
+$85.5M
3
BA icon
Boeing
BA
+$71M
4
INTC icon
Intel
INTC
+$60.7M
5
META icon
Meta Platforms (Facebook)
META
+$48.3M

Top Sells

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$117M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$104M
3
BABA icon
Alibaba
BABA
+$82.8M
4
DIS icon
Walt Disney
DIS
+$68.5M
5
C icon
Citigroup
C
+$59.8M

Sector Composition

Rank Sector Weight
1 Technology 0.38%
2 Healthcare 0.27%
3 Consumer Discretionary 0.25%
4 Industrials 0.17%
5 Communication Services 0.16%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
INSP icon
9301
Inspire Medical Systems
INSP
$1.46B
– –
-2,699
Closed -$529K
INTR icon
9302
Inter&Co
INTR
$2.41B
– –
-857
Closed -$4.7K
INTT icon
9303
inTEST
INTT
$185M
– –
-642
Closed -$7.6K
INTZ
9304
Intrusion
INTZ
$17.1M
$0 ﹤0.01%
+9
New +$39
INVA icon
9305
Innoviva
INVA
$1.56B
– –
-11,955
Closed -$188K
INVE icon
9306
CALL
Identive
INVE
$66.7M
– –
-1,300
Closed -$10K
IPSC icon
9307
CALL
Century Therapeutics
IPSC
$391M
– –
-1,800
Closed -$5K
IQ icon
9308
iQIYI
IQ
$1.17B
– –
-194,693
Closed -$749K
IQV icon
9309
IQVIA
IQV
$34.6B
– –
-16,813
Closed -$3.93M
IRMD icon
9310
iRadimed
IRMD
$1.2B
– –
-37
Closed -$1.64K
IRT icon
9311
Independence Realty Trust
IRT
$3.87B
– –
-97,573
Closed -$1.49M
ISSC icon
9312
CALL
Innovative Solutions & Support
ISSC
$351M
– –
-3,700
Closed -$31K
ITEQ icon
9313
Amplify BlueStar Israel Technology ETF
ITEQ
$115M
– –
-43
Closed -$1K
ITGR icon
9314
Integer Holdings
ITGR
$3.31B
– –
-694
Closed -$73.7K
ITOS
9315
DELISTED
iTeos Therapeutics
ITOS
– –
-6,426
Closed -$70K
ITRN icon
9316
Ituran Location and Control
ITRN
$1.09B
– –
-1,726
Closed -$45.6K
IVOL icon
9317
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$274M
– –
-457
Closed -$9K
IVT icon
9318
PUT
InvenTrust Properties
IVT
$2.79B
– –
-300
Closed -$7K
IVVD icon
9319
PUT
Invivyd
IVVD
$179M
– –
-1,000
Closed -$3K
IWB icon
9320
iShares Russell 1000 ETF
IWB
$47.7B
– –
-3,075
Closed -$806K
IWM icon
9321
iShares Russell 2000 ETF
IWM
$81.2B
– –
-132,945
Closed -$26.7M
IXG icon
9322
iShares Global Financials ETF
IXG
$648M
– –
-32
Closed -$2K
IXN icon
9323
iShares Global Tech ETF
IXN
$8.85B
– –
-1,885
Closed -$128K
IYG icon
9324
iShares US Financial Services ETF
IYG
$2.12B
$0 ﹤0.01%
15
-720
-98% -$44.7K
IZEA icon
9325
IZEA Worldwide
IZEA
$59.5M
$0 ﹤0.01%
+430
New +$875
371 372
373
374 375

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Simplex Trading's Q1 2024 Portfolio in Review

As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.

By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
  • Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
  • Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
  • Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
  • Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
  • Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.

Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.