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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
+18.73%
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
$55.7B
AUM Growth
-$21.5B
Cap. Flow
-$23.5B
Cap. Flow %
-42.23%
Top 10 Hldgs %
43.23%
Holding
10,706
New
2,258
Increased
3,361
Reduced
3,151
Closed
1,706

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$67.5M
2
PLTR icon
Palantir
PLTR
+$64.7M
3
PARA
Paramount Global Class B
PARA
+$31.5M
4
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$30.7M
5
CCL icon
Carnival Corporation Ltd
CCL
+$25.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
TSLA icon
Tesla
TSLA
+$53.7M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$38.1M
4
QQQ icon
Invesco QQQ Trust
QQQ
+$37.6M
5
AZO icon
AutoZone
AZO
+$28.5M

Sector Composition

Rank Sector Weight
1 Technology 0.65%
2 Consumer Discretionary 0.49%
3 Healthcare 0.32%
4 Financials 0.3%
5 Industrials 0.29%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IR icon
9351
Ingersoll Rand
IR
$33B
– –
-2,887
Closed -$134K
IRBT
9352
CALL
DELISTED
iRobot
IRBT
– –
-1,316
Closed -$10.6M
IRBT
9353
DELISTED
iRobot
IRBT
$0 ﹤0.01%
+2,469
New +$281K
IRBT
9354
PUT
DELISTED
iRobot
IRBT
– –
-1,479
Closed -$11.9M
IRM icon
9355
CALL
Iron Mountain
IRM
$38.2B
– –
-445
Closed -$1.31M
IRM icon
9356
PUT
Iron Mountain
IRM
$38.2B
– –
-370
Closed -$1.09M
ITGR icon
9357
Integer Holdings
ITGR
$3.35B
– –
-1,322
Closed -$112K
ITP icon
9358
IT Tech Packaging
ITP
$2.92M
– –
-340
Closed -$2.74K
ITT icon
9359
ITT
ITT
$17.5B
– –
-343
Closed -$28.3K
IVE icon
9360
iShares S&P 500 Value ETF
IVE
$48.9B
$0 ﹤0.01%
+1,237
New +$167K
IWF icon
9361
iShares Russell 1000 Growth ETF
IWF
$122B
– –
-112,076
Closed -$6.76M
IWM icon
9362
iShares Russell 2000 ETF
IWM
$80.9B
$0 ﹤0.01%
347,061
+309,022
+812% +$67.5M
IWS icon
9363
iShares Russell Mid-Cap Value ETF
IWS
$15.7B
– –
-14,068
Closed -$1.36M
IYH icon
9364
iShares US Healthcare ETF
IYH
$3.11B
– –
-290
Closed -$14K
IYJ icon
9365
iShares US Industrials ETF
IYJ
$1.98B
– –
-894
Closed -$86K
IYM icon
9366
iShares US Basic Materials ETF
IYM
$1.16B
– –
-5,101
Closed -$578K
JAGX icon
9367
Jaguar Health
JAGX
$4.73M
– –
0
– –
JAMF
9368
DELISTED
Jamf
JAMF
– –
-33,982
Closed -$1.24M
JAZZ icon
9369
Jazz Pharmaceuticals
JAZZ
$15.9B
– –
-1,367
Closed -$225K
JBGS
9370
JBG SMITH
JBGS
$846M
– –
-436
Closed -$13.8K
JBGS
9371
PUT
JBG SMITH
JBGS
$846M
– –
-20
Closed -$62K
JDST icon
9372
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$30.4M
$0 ﹤0.01%
4
– –
JILL icon
9373
CALL
J. Jill
JILL
$252M
– –
-95
Closed -$35K
JKS
9374
CALL
JinkoSolar
JKS
$775M
– –
-1,031
Closed -$6.38M
JKS
9375
JinkoSolar
JKS
$775M
$0 ﹤0.01%
+220
New +$12.3K
373 374
375
376 377

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Simplex Trading's Q1 2021 Portfolio in Review

As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.

  • Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
  • Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
  • Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
  • Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
  • Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.

Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.