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 | |
|---|---|---|---|---|---|---|
7201
Avalo Therapeutics
AVTX
$1.01B
| $70K | ﹤0.01% |
7
+6
| +600% | +$50.3K |
|
7202
PUT
CrossAmerica Partners
CAPL
$834M
| $70K | ﹤0.01% |
3,700
+3,663
| +9,900% | +$72K |
|
7203
Ducommun
DCO
$2.56B
| $70K | ﹤0.01% |
+1,300
| New | +$73.9K |
|
|
DHC
7204
Diversified Healthcare Trust
DHC
$2.15B
| $70K | ﹤0.01% |
16,846
-742
| -4% | -$3.06K |
|
7205
Globalstar
GSAT
$10.1B
| $70K | ﹤0.01% |
2,633
-4,178
| -61% | -$82K |
|
|
MRC
7206
CALL
DELISTED
MRC Global
MRC
| $70K | ﹤0.01% |
7,500
+7,270
| +3,161% | +$73.8K |
|
7207
CALL
Pebblebrook Hotel Trust
PEB
$2.18B
| $70K | ﹤0.01% |
3,000
+2,917
| +3,514% | +$68.7K |
|
7208
Royalty Pharma
RPRX
$26.2B
| $70K | ﹤0.01% |
1,729
+1,303
| +306% | +$55.4K |
|
7209
Direxion Daily Dow Jones Internet Bull 3X ETF
WEBL
$85.4M
| $70K | ﹤0.01% |
+786
| New | +$58.7K |
|
|
VOXX
7210
PUT
DELISTED
VOXX International Corporation Class A
VOXX
| $70K | ﹤0.01% |
5,000
+4,893
| +4,573% | +$79.3K |
|
|
TFFP
7211
PUT
DELISTED
TFF Pharmaceuticals, Inc. Common Stock
TFFP
| $70K | ﹤0.01% |
292
+285
| +4,071% | +$78.1K |
|
|
CTG
7212
PUT
DELISTED
Computer Task Group, Inc.
CTG
| $70K | ﹤0.01% |
7,300
+7,187
| +6,360% | +$72.2K |
|
|
RUBY
7213
CALL
DELISTED
Rubius Therapeutics, Inc
RUBY
| $70K | ﹤0.01% |
2,900
+2,785
| +2,422% | +$69.7K |
|
|
SNR
7214
CALL
DELISTED
NEW SENIOR INVESTMENT GROUP INC.
SNR
| $70K | ﹤0.01% |
8,000
+7,840
| +4,900% | +$54K |
|
7215
CALL
Accuray
ARAY
$27.5M
| $69K | ﹤0.01% |
15,400
+15,286
| +13,409% | +$71.6K |
|
7216
CALL
AYTU BioPharma
AYTU
$22.3M
| $69K | ﹤0.01% |
690
+688
| +34,400% | +$80.7K |
|
7217
Caleres
CAL
$432M
| $69K | ﹤0.01% |
2,530
-23,500
| -90% | -$589K |
|
7218
PUT
Fate Therapeutics
FATE
$275M
| $69K | ﹤0.01% |
800
+785
| +5,233% | +$63.3K |
|
|
DMC
7219
Del Monte Corp
DMC
$1.42B
| $69K | ﹤0.01% |
2,119
-1,760
| -45% | -$56.8K |
|
7220
CALL
i3 Verticals
IIIV
$419M
| $69K | ﹤0.01% |
2,300
+2,259
| +5,510% | +$71.6K |
|
7221
Amplify Mobile Payments ETF
IPAY
$173M
| $69K | ﹤0.01% |
992
+570
| +135% | +$39.8K |
|
7222
iShares MSCI Saudi Arabia ETF
KSA
$612M
| $69K | ﹤0.01% |
1,760
+1,552
| +746% | +$58.8K |
|
7223
CALL
Principal Financial Group
PFG
$24.3B
| $69K | ﹤0.01% |
1,100
+780
| +244% | +$49.9K |
|
|
PLYA
7224
PUT
DELISTED
Playa Hotels & Resorts
PLYA
| $69K | ﹤0.01% |
9,400
+9,369
| +30,223% | +$69.1K |
|
7225
CALL
Red Robin
RRGB
$139M
| $69K | ﹤0.01% |
2,100
+1,876
| +838% | +$64K |
|
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.