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 | |
|---|---|---|---|---|---|---|
8226
PUT
Palomar
PLMR
$3.73B
| $30K | ﹤0.01% |
400
+394
| +6,567% | +$28.4K |
|
8227
PUT
Primerica
PRI
$9.81B
| $30K | ﹤0.01% |
200
+198
| +9,900% | +$31.3K |
|
|
BCIC
8228
PUT
BCP Investment Corp
BCIC
$88.1M
| $30K | ﹤0.01% |
1,300
+1,293
| +18,471% | +$30.7K |
|
8229
CALL
Replimune Group
REPL
$724M
| $30K | ﹤0.01% |
800
+788
| +6,567% | +$26.9K |
|
8230
CALL
abrdn Physical Gold Shares ETF
SGOL
$6.97B
| $30K | ﹤0.01% |
1,800
+1,538
| +587% | +$26.8K |
|
8231
PUT
Silicon Laboratories
SLAB
$7.17B
| $30K | ﹤0.01% |
200
+199
| +19,900% | +$27.8K |
|
8232
Tidewater
TDW
$3.91B
| $30K | ﹤0.01% |
2,519
-2,765
| -52% | -$36.7K |
|
8233
CALL
Team
TISI
$77.7M
| $30K | ﹤0.01% |
460
+452
| +5,650% | +$41.1K |
|
|
TPH
8234
PUT
DELISTED
Tri Pointe Homes
TPH
| $30K | ﹤0.01% |
1,400
+1,373
| +5,085% | +$31.4K |
|
|
TRIB
8235
PUT
Trinity Biotech
TRIB
$6.18M
| $30K | ﹤0.01% |
+70
| New | +$34.9K |
|
|
TRST
8236
PUT
Trustco Bank Corp NY
TRST
$978M
| $30K | ﹤0.01% |
900
+897
| +29,900% | +$33.2K |
|
8237
ProShares Ultra Euro
ULE
$4.28M
| $30K | ﹤0.01% |
2,100
+1,300
| +163% | +$19.8K |
|
8238
Veeco
VECO
$2.96B
| $30K | ﹤0.01% |
1,256
-52,209
| -98% | -$1.2M |
|
8239
WEX
WEX
$6.07B
| $30K | ﹤0.01% |
155
-10,033
| -98% | -$2.06M |
|
|
WIRE
8240
PUT
DELISTED
Encore Wire Corp
WIRE
| $30K | ﹤0.01% |
400
+348
| +669% | +$26.8K |
|
|
MODN
8241
PUT
DELISTED
MODEL N, INC.
MODN
| $30K | ﹤0.01% |
900
+890
| +8,900% | +$32.6K |
|
|
KBNT
8242
CALL
DELISTED
Kubient, Inc. Common Stock
KBNT
| $30K | ﹤0.01% |
+5,400
| New | +$31.5K |
|
|
PHAS
8243
CALL
DELISTED
PhaseBio Pharmaceuticals, Inc. Common Stock
PHAS
| $30K | ﹤0.01% |
8,300
+8,168
| +6,188% | +$27.2K |
|
|
SPRT
8244
DELISTED
support.com, Inc.
SPRT
| $30K | ﹤0.01% |
7,880
-5,247
| -40% | -$19K |
|
|
CIT
8245
CALL
DELISTED
CIT Group Inc.
CIT
| $30K | ﹤0.01% |
600
+594
| +9,900% | +$31.2K |
|
8246
AC Immune
ACIU
$234M
| $29K | ﹤0.01% |
3,740
-3,890
| -51% | -$26.9K |
|
8247
CALL
AngioDynamics
ANGO
$565M
| $29K | ﹤0.01% |
1,100
+1,085
| +7,233% | +$26.5K |
|
|
BQ
8248
Boqii Holding Ltd
BQ
$6.19M
| $29K | ﹤0.01% |
32
-24
| -43% | -$22.6K |
|
8249
BioXcel Therapeutics
BTAI
$26.8M
| $29K | ﹤0.01% |
63
-63
| -50% | -$34.3K |
|
8250
CALL
Commerce Bancshares
CBSH
$8.49B
| $29K | ﹤0.01% |
511
+507
| +12,675% | +$30.6K |
|
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.