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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6426
CALL
Celcuity
CELC
$4.22B
| $41K | ﹤0.01% |
1,900
+500
| +36% | +$7.98K |
|
6427
Viant Technology
DSP
$236M
| $41K | ﹤0.01% |
+3,862
| New | +$33.6K |
|
6428
CALL
CapForce IBD 50 ETF
FFTY
$79.9M
| $41K | ﹤0.01% |
+1,500
| New | +$39.2K |
|
6429
CALL
Gladstone Investment Corp
GAIN
$644M
| $41K | ﹤0.01% |
2,900
+400
| +16% | +$5.68K |
|
6430
CALL
Genmab
GMAB
$17.7B
| $41K | ﹤0.01% |
1,400
-200
| -13% | -$5.88K |
|
6431
PUT
Kite Realty
KRG
$5.8B
| $41K | ﹤0.01% |
1,900
| – | – |
|
6432
Laureate Education
LAUR
$5.24B
| $41K | ﹤0.01% |
+2,826
| New | +$37.4K |
|
6433
LivePerson
LPSN
$22M
| $41K | ﹤0.01% |
2,757
+2,168
| +368% | +$74.6K |
|
6434
PUT
Newegg Commerce
NEGG
$280M
| $41K | ﹤0.01% |
2,270
+990
| +77% | +$18.9K |
|
6435
PUT
Outset Medical
OM
$85.5M
| $41K | ﹤0.01% |
1,247
-5,200
| -81% | -$263K |
|
|
ORGN
6436
CALL
DELISTED
Origin Materials
ORGN
| $41K | ﹤0.01% |
2,737
+714
| +35% | +$12.4K |
|
6437
Protolabs
PRLB
$1.78B
| $41K | ﹤0.01% |
1,161
-993
| -46% | -$35.9K |
|
6438
CALL
Avita Medical
RCEL
$134M
| $41K | ﹤0.01% |
2,600
-5,800
| -69% | -$93.9K |
|
6439
PUT
REX American Resources
REX
$1.42B
| $41K | ﹤0.01% |
1,400
+1,000
| +250% | +$22K |
|
6440
Sasol
SSL
$7.5B
| $41K | ﹤0.01% |
+5,289
| New | +$43.5K |
|
|
NSLR
6441
PUT
Neostellar Capital Corp
NSLR
$267M
| $41K | ﹤0.01% |
9,200
| – | – |
|
6442
ProShares VIX Mid-Term Futures ETF
VIXM
$55.9M
| $41K | ﹤0.01% |
2,637
+776
| +42% | +$12.4K |
|
6443
PUT
Wintrust Financial
WTFC
$10.8B
| $41K | ﹤0.01% |
+400
| New | +$38.6K |
|
|
AGR
6444
DELISTED
Avangrid, Inc.
AGR
| $41K | ﹤0.01% |
1,150
+1,082
| +1,591% | +$35.3K |
|
6445
CALL
Digital Turbine
APPS
$972M
| $40K | ﹤0.01% |
15,600
-459,900
| -97% | -$1.95M |
|
6446
American States Water
AWR
$3.35B
| $40K | ﹤0.01% |
555
+465
| +517% | +$34.7K |
|
6447
BioXcel Therapeutics
BTAI
$25.1M
| $40K | ﹤0.01% |
+895
| New | +$42.7K |
|
6448
Ceco Environmental
CECO
$3.86B
| $40K | ﹤0.01% |
+1,753
| New | +$36.1K |
|
6449
PUT
Cullinan Oncology
CGEM
$1.01B
| $40K | ﹤0.01% |
2,400
+1,100
| +85% | +$17K |
|
6450
Coherus Oncology
CHRS
$219M
| $40K | ﹤0.01% |
17,037
-56,001
| -77% | -$138K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.