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 | |
|---|---|---|---|---|---|---|
|
IMVP
7426
Invesco India ETF
IMVP
$124M
| $60K | ﹤0.01% |
2,347
-2,800
| -54% | -$69.8K |
|
7427
PUT
Personalis
PSNL
$1.25B
| $60K | ﹤0.01% |
2,400
+2,384
| +14,900% | +$54.6K |
|
7428
CALL
Research Frontiers
REFR
$13.6M
| $60K | ﹤0.01% |
+25,400
| New | +$63.3K |
|
7429
CALL
Syndax Pharmaceuticals
SNDX
$1.7B
| $60K | ﹤0.01% |
3,500
+3,427
| +4,695% | +$62.8K |
|
|
UBX
7430
PUT
DELISTED
Unity Biotechnology
UBX
| $60K | ﹤0.01% |
1,310
+1,300
| +13,000% | +$62.6K |
|
7431
Veru
VERU
$35.5M
| $60K | ﹤0.01% |
755
-355
| -32% | -$31.3K |
|
7432
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.2B
| $60K | ﹤0.01% |
1,100
+100
| +10% | +$5.51K |
|
|
GTT
7433
CALL
DELISTED
GTT Communications, Inc.
GTT
| $60K | ﹤0.01% |
111,800
+111,652
| +75,441% | +$217K |
|
|
CBB
7434
PUT
DELISTED
Cincinnati Bell Inc.
CBB
| $60K | ﹤0.01% |
3,900
+3,873
| +14,344% | +$59.7K |
|
7435
CALL
AMERISAFE
AMSF
$562M
| $59K | ﹤0.01% |
+1,000
| New | +$63.5K |
|
7436
CALL
Avalo Therapeutics
AVTX
$1.01B
| $59K | ﹤0.01% |
+6
| New | +$50.3K |
|
7437
ProShares UltraShort Dow 30
DXD
$43.6M
| $59K | ﹤0.01% |
1,262
+376
| +42% | +$18.2K |
|
7438
CALL
INmune Bio
INMB
$44.9M
| $59K | ﹤0.01% |
+3,400
| New | +$45.8K |
|
7439
CALL
IZEA Worldwide
IZEA
$58.7M
| $59K | ﹤0.01% |
5,800
+5,724
| +7,532% | +$75.1K |
|
7440
Kosmos Energy
KOS
$1.47B
| $59K | ﹤0.01% |
17,056
-26,369
| -61% | -$81.7K |
|
|
MTLS
7441
Materialise
MTLS
$366M
| $59K | ﹤0.01% |
2,473
+566
| +30% | +$15.9K |
|
7442
SunCoke Energy
SXC
$794M
| $59K | ﹤0.01% |
8,286
+6,906
| +500% | +$49.2K |
|
7443
PUT
Telecom Argentina
TEO
$5.84B
| $59K | ﹤0.01% |
+11,200
| New | +$59K |
|
|
WKEY
7444
PUT
WISeKey
WKEY
$67.1M
| $59K | ﹤0.01% |
+1,660
| New | +$71K |
|
|
SQSP
7445
PUT
DELISTED
Squarespace, Inc.
SQSP
| $59K | ﹤0.01% |
+1,000
| New | +$57K |
|
|
FRGI
7446
PUT
DELISTED
Fiesta Restaurant Group, Inc.
FRGI
| $59K | ﹤0.01% |
4,400
+4,370
| +14,567% | +$59.6K |
|
|
VCRA
7447
PUT
DELISTED
VOCERA COMMUNICATIONS, INC.
VCRA
| $59K | ﹤0.01% |
1,500
+1,483
| +8,724% | +$54.1K |
|
|
RNWK
7448
DELISTED
RealNetworks Inc
RNWK
| $59K | ﹤0.01% |
25,459
-55,210
| -68% | -$161K |
|
|
BRSP
7449
PUT
BrightSpire Capital
BRSP
$634M
| $58K | ﹤0.01% |
6,200
+6,185
| +41,233% | +$57K |
|
7450
CALL
CAE Inc. Common Shares
CAE
$8.44B
| $58K | ﹤0.01% |
1,900
+1,769
| +1,350% | +$54.1K |
|
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.