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 | |
|---|---|---|---|---|---|---|
2476
CALL
Terex
TEX
$7.98B
| $1.6M | ﹤0.01% |
33,600
+33,552
| +69,900% | +$1.63M |
|
|
PSXP
2477
PUT
DELISTED
PHILLIPS 66 PARTNERS LP
PSXP
| $1.59M | ﹤0.01% |
+40,400
| New | +$1.49M |
|
|
ROCC
2478
CALL
DELISTED
Ranger Oil Corporation Class A Common Stock
ROCC
| $1.59M | ﹤0.01% |
67,500
+67,226
| +24,535% | +$1.23M |
|
2479
STAAR Surgical
STAA
$1.16B
| $1.59M | ﹤0.01% |
10,440
+7,196
| +222% | +$948K |
|
|
DM
2480
CALL
DELISTED
Desktop Metal, Inc.
DM
| $1.59M | ﹤0.01% |
13,830
+13,707
| +11,144% | +$1.8M |
|
|
CYBR
2481
DELISTED
CyberArk
CYBR
| $1.59M | ﹤0.01% |
+12,198
| New | +$1.63M |
|
2482
8x8 Inc
EGHT
$247M
| $1.59M | ﹤0.01% |
57,257
+50,621
| +763% | +$1.44M |
|
2483
CALL
Ares Capital
ARCC
$13.5B
| $1.59M | ﹤0.01% |
81,100
+80,454
| +12,454% | +$1.56M |
|
|
CZOO
2484
CALL
DELISTED
Cazoo Group Ltd
CZOO
| $1.59M | ﹤0.01% |
80
+77
| +2,567% | +$1.54M |
|
2485
ProShares Ultra S&P500
SSO
$7.82B
| $1.59M | ﹤0.01% |
53,216
+13,156
| +33% | +$372K |
|
2486
CALL
Texas Roadhouse
TXRH
$12.7B
| $1.59M | ﹤0.01% |
16,500
+16,412
| +18,650% | +$1.61M |
|
2487
PUT
Robert Half
RHI
$3.61B
| $1.58M | ﹤0.01% |
17,800
+17,764
| +49,344% | +$1.55M |
|
2488
CALL
Renaissance IPO ETF
IPO
$154M
| $1.58M | ﹤0.01% |
23,900
+23,327
| +4,071% | +$1.45M |
|
2489
PUT
Pembina Pipeline
PBA
$29.9B
| $1.58M | ﹤0.01% |
49,800
+48,821
| +4,987% | +$1.53M |
|
2490
PUT
Performance Food Group
PFGC
$17.5B
| $1.58M | ﹤0.01% |
32,600
+32,596
| +814,900% | +$1.72M |
|
|
TWOU
2491
PUT
DELISTED
2U Inc
TWOU
| $1.58M | ﹤0.01% |
1,263
+1,250
| +9,615% | +$1.44M |
|
2492
PUT
Blink Charging
BLNK
$75.2M
| $1.58M | ﹤0.01% |
38,300
+37,335
| +3,869% | +$1.39M |
|
2493
Illumina
ILMN
$29.4B
| $1.58M | ﹤0.01% |
3,425
+3,322
| +3,225% | +$1.34M |
|
2494
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $1.58M | ﹤0.01% |
34,200
+33,539
| +5,074% | +$1.41M |
|
2495
CALL
Iridium Communications
IRDM
$4.85B
| $1.57M | ﹤0.01% |
39,400
+38,860
| +7,196% | +$1.51M |
|
2496
Madrigal Pharmaceuticals
MDGL
$12.6B
| $1.57M | ﹤0.01% |
16,163
+11,313
| +233% | +$1.34M |
|
|
RMGB
2497
CALL
DELISTED
RMG Acquisition Corp. II Class A Ordinary Shares
RMGB
| $1.57M | ﹤0.01% |
158,100
+158,044
| +282,221% | +$1.57M |
|
|
AHT
2498
Ashford Hospitality Trust
AHT
$21M
| $1.57M | ﹤0.01% |
3,448
+538
| +18% | +$195K |
|
2499
CALL
MGIC Investment
MTG
$6.27B
| $1.57M | ﹤0.01% |
115,400
+114,068
| +8,564% | +$1.64M |
|
2500
CALL
BlackLine
BL
$1.69B
| $1.57M | ﹤0.01% |
14,100
+13,981
| +11,749% | +$1.53M |
|
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.