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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5551
Intrepid Potash
IPI
$456M
| $218K | ﹤0.01% |
+6,853
| New | +$202K |
|
|
SLNO
5552
PUT
DELISTED
Soleno Therapeutics
SLNO
| $218K | ﹤0.01% |
12,753
+12,732
| +60,629% | +$215K |
|
5553
CALL
World Kinect Corp
WKC
$2.04B
| $218K | ﹤0.01% |
+6,900
| New | +$229K |
|
|
BLD
5554
CALL
DELISTED
TopBuild
BLD
| $217K | ﹤0.01% |
1,100
+1,096
| +27,400% | +$227K |
|
5555
Travere Therapeutics
TVTX
$5.2B
| $217K | ﹤0.01% |
14,888
+12,800
| +613% | +$252K |
|
|
SC
5556
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $217K | ﹤0.01% |
+5,978
| New | +$208K |
|
|
QADA
5557
PUT
DELISTED
QAD Inc.
QADA
| $217K | ﹤0.01% |
2,500
+2,499
| +249,900% | +$182K |
|
5558
PUT
H.B. Fuller
FUL
$2.97B
| $216K | ﹤0.01% |
3,400
+3,370
| +11,233% | +$226K |
|
5559
iShares MSCI USA Min Vol Factor ETF
USMV
$23.5B
| $216K | ﹤0.01% |
+2,935
| New | +$212K |
|
5560
CALL
Veeco
VECO
$3.05B
| $216K | ﹤0.01% |
9,000
+8,966
| +26,371% | +$205K |
|
|
ARCH
5561
CALL
DELISTED
Arch Resources, Inc.
ARCH
| $216K | ﹤0.01% |
3,800
+3,759
| +9,168% | +$196K |
|
|
CFRX
5562
CALL
DELISTED
ContraFect Corporation
CFRX
| $216K | ﹤0.01% |
615
+607
| +7,588% | +$199K |
|
5563
PUT
Americold
COLD
$4.02B
| $215K | ﹤0.01% |
5,700
+5,436
| +2,059% | +$210K |
|
5564
PUT
Ethan Allen Interiors
ETD
$570M
| $215K | ﹤0.01% |
7,800
+7,758
| +18,471% | +$224K |
|
5565
Trupanion
TRUP
$1.07B
| $215K | ﹤0.01% |
+1,874
| New | +$163K |
|
|
YSG
5566
PUT
Yatsen Holding
YSG
$322M
| $215K | ﹤0.01% |
4,600
+4,528
| +6,289% | +$234K |
|
|
SPPI
5567
PUT
DELISTED
Spectrum Pharmaceuticals Inc
SPPI
| $215K | ﹤0.01% |
+57,400
| New | +$199K |
|
5568
CALL
Advanced Energy
AEIS
$11.6B
| $214K | ﹤0.01% |
1,900
+1,854
| +4,030% | +$196K |
|
5569
PUT
Clean Harbors
CLH
$16.5B
| $214K | ﹤0.01% |
2,300
+2,264
| +6,289% | +$206K |
|
5570
PUT
Idacorp
IDA
$7.92B
| $214K | ﹤0.01% |
2,200
+2,176
| +9,067% | +$218K |
|
|
GPUS
5571
Hyperscale Data Inc
GPUS
$55.4M
| – | – |
-1
| Closed | -$430K |
|
|
PRVB
5572
PUT
DELISTED
Provention Bio, Inc. Common Stock
PRVB
| $214K | ﹤0.01% |
25,400
+25,255
| +17,417% | +$204K |
|
5573
PUT
Allogene Therapeutics
ALLO
$649M
| $213K | ﹤0.01% |
8,200
+8,192
| +102,400% | +$234K |
|
5574
BlueLinx
BXC
$422M
| $213K | ﹤0.01% |
4,249
-4,991
| -54% | -$246K |
|
5575
PUT
Rhythm Pharmaceuticals
RYTM
$6.81B
| $213K | ﹤0.01% |
10,900
+10,798
| +10,586% | +$224K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.