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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5301
PUT
W&T Offshore
WTI
$534M
| $94K | ﹤0.01% |
43,800
-2,300
| -5% | -$5.11K |
|
|
MRNS
5302
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $94K | ﹤0.01% |
53,637
-11,404
| -18% | -$15.9K |
|
5303
ProFrac Holding
ACDC
$731M
| $93K | ﹤0.01% |
13,826
-7,687
| -36% | -$53.9K |
|
5304
PUT
Beam Therapeutics
BEAM
$2.63B
| $93K | ﹤0.01% |
3,800
-35,800
| -90% | -$925K |
|
5305
PUT
United States Brent Oil Fund
BNO
$781M
| $93K | ﹤0.01% |
3,300
-1,400
| -30% | -$42.3K |
|
5306
CALL
Clean Energy Fuels
CLNE
$427M
| $93K | ﹤0.01% |
30,100
+13,300
| +79% | +$37.7K |
|
5307
CALL
Farmers National Banc Corp
FMNB
$939M
| $93K | ﹤0.01% |
6,200
-400
| -6% | -$5.79K |
|
|
REFI
5308
CALL
Chicago Atlantic Real Estate Finance
REFI
$248M
| $93K | ﹤0.01% |
6,000
-1,500
| -20% | -$23.5K |
|
5309
CALL
Sensata Technologies
ST
$6.74B
| $93K | ﹤0.01% |
2,600
-60,100
| -96% | -$2.24M |
|
5310
CALL
TETRA Technologies
TTI
$1.14B
| $93K | ﹤0.01% |
30,000
+7,300
| +32% | +$23.6K |
|
5311
CALL
Alto Ingredients
ALTO
$369M
| $92K | ﹤0.01% |
57,400
+12,200
| +27% | +$18.4K |
|
5312
PUT
Arcutis Biotherapeutics
ARQT
$3.36B
| $92K | ﹤0.01% |
9,900
-8,300
| -46% | -$81.9K |
|
5313
PUT
Descartes Systems
DSGX
$6.44B
| $92K | ﹤0.01% |
+900
| New | +$89.5K |
|
5314
PUT
Enova International
ENVA
$6.33B
| $92K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$77.5K |
|
5315
CALL
Equitable Holdings
EQH
$13B
| $92K | ﹤0.01% |
2,200
-400
| -15% | -$16.4K |
|
5316
PUT
Cedar Fair
FUN
$1.77B
| $92K | ﹤0.01% |
2,300
+1,400
| +156% | +$64K |
|
5317
PUT
Silicon Laboratories
SLAB
$7.17B
| $92K | ﹤0.01% |
800
-1,200
| -60% | -$134K |
|
5318
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.4B
| $92K | ﹤0.01% |
3,184
+2,690
| +545% | +$76.7K |
|
|
VERV
5319
DELISTED
Verve Therapeutics
VERV
| $92K | ﹤0.01% |
19,077
-8,394
| -31% | -$48.8K |
|
5320
CALL
Arbutus Biopharma
ABUS
$857M
| $91K | ﹤0.01% |
23,800
+7,400
| +45% | +$28.4K |
|
5321
CALL
InfraCap MLP ETF
AMZA
$470M
| $91K | ﹤0.01% |
2,300
-5,200
| -69% | -$212K |
|
5322
CALL
Arvinas
ARVN
$518M
| $91K | ﹤0.01% |
3,700
-20,100
| -84% | -$525K |
|
5323
Mitsubishi UFJ Financial
MUFG
$253B
| $91K | ﹤0.01% |
8,962
+4,205
| +88% | +$44.4K |
|
|
RNAM
5324
PUT
DELISTED
Avidity Biosciences
RNAM
| $91K | ﹤0.01% |
2,000
-50,300
| -96% | -$2.18M |
|
5325
PUT
Sabra Healthcare REIT
SBRA
$5.34B
| $91K | ﹤0.01% |
4,900
+3,400
| +227% | +$57.3K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.