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 | |
|---|---|---|---|---|---|---|
6176
Quanex
NX
$819M
| $146K | ﹤0.01% |
5,894
+5,510
| +1,435% | +$147K |
|
6177
FreightCar America
RAIL
$261M
| $146K | ﹤0.01% |
24,702
-14,043
| -36% | -$85.4K |
|
6178
PUT
Valley National Bancorp
VLY
$7.9B
| $146K | ﹤0.01% |
10,900
+10,510
| +2,695% | +$147K |
|
6179
PUT
Walker & Dunlop
WD
$1.71B
| $146K | ﹤0.01% |
1,400
+1,398
| +69,900% | +$146K |
|
|
SPRT
6180
PUT
DELISTED
support.com, Inc.
SPRT
| $146K | ﹤0.01% |
+38,000
| New | +$138K |
|
6181
BBVA Argentina
BBAR
$3.87B
| $145K | ﹤0.01% |
44,721
+40,764
| +1,030% | +$127K |
|
6182
PUT
Evolent Health
EVH
$348M
| $145K | ﹤0.01% |
+6,900
| New | +$138K |
|
|
FRSX
6183
Foresight Autonomous Holdings
FRSX
$3.9M
| $145K | ﹤0.01% |
272
-144
| -35% | -$82.5K |
|
6184
CALL
Genpact
G
$5.96B
| $145K | ﹤0.01% |
3,200
+3,191
| +35,456% | +$144K |
|
6185
CALL
Geron
GERN
$828M
| $145K | ﹤0.01% |
+103,300
| New | +$150K |
|
|
TPIC
6186
CALL
DELISTED
TPI Composites
TPIC
| $145K | ﹤0.01% |
3,000
+2,965
| +8,471% | +$146K |
|
6187
CALL
Yext
YEXT
$547M
| $145K | ﹤0.01% |
10,200
+9,966
| +4,259% | +$139K |
|
|
IBTX
6188
DELISTED
Independent Bank Group, Inc.
IBTX
| $145K | ﹤0.01% |
+1,967
| New | +$149K |
|
|
HPP
6189
PUT
Hudson Pacific Properties
HPP
$747M
| $144K | ﹤0.01% |
743
+738
| +14,760% | +$146K |
|
6190
CALL
Icon
ICLR
$12.6B
| $144K | ﹤0.01% |
700
+692
| +8,650% | +$149K |
|
6191
Methode Electronics
MEI
$496M
| $144K | ﹤0.01% |
2,928
-3,651
| -55% | -$170K |
|
6192
Old National Bancorp
ONB
$10.2B
| $144K | ﹤0.01% |
8,183
+8,143
| +20,358% | +$154K |
|
6193
ProShares UltraShort S&P500
SDS
$415M
| $144K | ﹤0.01% |
+638
| New | +$154K |
|
6194
PUT
SI-BONE Inc
SIBN
$788M
| $144K | ﹤0.01% |
+4,600
| New | +$149K |
|
|
PRFT
6195
CALL
DELISTED
Perficient Inc
PRFT
| $144K | ﹤0.01% |
+1,800
| New | +$127K |
|
|
MIXT
6196
DELISTED
MIX TELEMATICS LIMITED
MIXT
| $144K | ﹤0.01% |
+8,719
| New | +$123K |
|
|
IMGN
6197
DELISTED
Immunogen Inc
IMGN
| $144K | ﹤0.01% |
+21,900
| New | +$153K |
|
|
LTRPA
6198
DELISTED
Liberty TripAdvisor Holdings, Inc. Series A
LTRPA
| $144K | ﹤0.01% |
35,446
-24,256
| -41% | -$118K |
|
|
LTRPA
6199
PUT
DELISTED
Liberty TripAdvisor Holdings, Inc. Series A
LTRPA
| $144K | ﹤0.01% |
35,600
+35,389
| +16,772% | +$172K |
|
6200
CALL
Alpha Pro Tech
APT
$50.4M
| $143K | ﹤0.01% |
16,700
+16,587
| +14,679% | +$145K |
|
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.