Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
|
PR
2601
PUT
Permian Resources
PR
$17.2B
| $850K | ﹤0.01% |
2,026
+1,640
| +425% | +$5.75K |
|
2602
CALL
SkinHealth Systems
SKIN
$100M
| $849K | ﹤0.01% |
+787
| New | +$8.65K |
|
|
HGEN
2603
CALL
DELISTED
HUMANIGEN, INC.
HGEN
| $849K | ﹤0.01% |
445
+341
| +328% | +$6.22K |
|
2604
Knowles
KN
$3.11B
| $848K | ﹤0.01% |
40,537
+10,617
| +35% | +$216K |
|
|
CVM.WS
2605
CALL
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $848K | ﹤0.01% |
+558
| New | +$848K |
|
2606
PUT
BorgWarner
BWA
$12.9B
| $847K | ﹤0.01% |
483
+418
| +643% | +$16.3K |
|
2607
National Vision
EYE
$1.67B
| $847K | ﹤0.01% |
+19,335
| New | +$921K |
|
2608
ACM Research
ACMR
$5.32B
| $846K | ﹤0.01% |
+31,440
| New | +$1.04M |
|
2609
Antero Resources
AR
$10.7B
| $845K | ﹤0.01% |
+82,871
| New | +$702K |
|
|
SILK
2610
CALL
DELISTED
Silk Road Medical, Inc. Common Stock
SILK
| $845K | ﹤0.01% |
+167
| New | +$9.28K |
|
2611
CALL
Texas Roadhouse
TXRH
$13.2B
| $844K | ﹤0.01% |
88
-36
| -29% | -$3.15K |
|
2612
PUT
Empire State Realty Trust
ESRT
$969M
| $843K | ﹤0.01% |
758
+604
| +392% | +$6.29K |
|
2613
Omeros
OMER
$833M
| $843K | ﹤0.01% |
47,392
-22,021
| -32% | -$428K |
|
2614
Direxion Daily FTSE China Bull 3X ETF
YINN
$703M
| $843K | ﹤0.01% |
2,186
-1,755
| -45% | -$849K |
|
|
NOVA
2615
DELISTED
Sunnova Energy
NOVA
| $842K | ﹤0.01% |
20,641
+5,358
| +35% | +$238K |
|
2616
PUT
Green Plains
GPRE
$1.16B
| $841K | ﹤0.01% |
311
-32
| -9% | -$733 |
|
2617
PUT
Lightspeed Commerce
LSPD
$1.35B
| $841K | ﹤0.01% |
134
+68
| +103% | +$4.64K |
|
2618
Alamos Gold
AGI
$12.5B
| $840K | ﹤0.01% |
107,589
-71,947
| -40% | -$578K |
|
2619
PUT
EQT Corp
EQT
$32.9B
| $839K | ﹤0.01% |
452
-276
| -38% | -$4.8K |
|
2620
PUT
MillerKnoll
MLKN
$1.53B
| $839K | ﹤0.01% |
204
+87
| +74% | +$3.33K |
|
2621
PUT
Matador Resources
MTDR
$6.04B
| $839K | ﹤0.01% |
358
+305
| +575% | +$6.09K |
|
2622
BRC Group Holdings
RILY
$266M
| $839K | ﹤0.01% |
+14,888
| New | +$803K |
|
2623
CALL
DTE Energy
DTE
$30.7B
| $838K | ﹤0.01% |
74
-14
| -16% | -$1.47K |
|
2624
CALL
Equitable Holdings
EQH
$13.2B
| $838K | ﹤0.01% |
257
+128
| +99% | +$3.69K |
|
|
DCP
2625
PUT
DELISTED
DCP Midstream, LP
DCP
| $838K | ﹤0.01% |
387
-55
| -12% | -$1.21K |
|
Similar funds
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.