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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2351
PUT
Shift4
FOUR
$3.84B
| $2.01M | ﹤0.01% |
27,100
-29,600
| -52% | -$1.77M |
|
2352
CALL
Herbalife
HLF
$1.23B
| $2.01M | ﹤0.01% |
131,700
-91,800
| -41% | -$1.27M |
|
|
BECN
2353
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $2M | ﹤0.01% |
23,000
+21,700
| +1,669% | +$1.7M |
|
2354
CALL
United Natural Foods
UNFI
$3.01B
| $2M | ﹤0.01% |
123,200
+99,200
| +413% | +$1.51M |
|
2355
CALL
American Superconductor
AMSC
$1.48B
| $1.99M | ﹤0.01% |
178,900
-85,000
| -32% | -$719K |
|
2356
Chipotle Mexican Grill
CMG
$40.8B
| $1.99M | ﹤0.01% |
+43,550
| New | +$1.81M |
|
|
CAN
2357
CALL
Canaan Creative
CAN
$176M
| $1.99M | ﹤0.01% |
861,300
+808,500
| +1,531% | +$1.51M |
|
2358
CALL
Sabre
SABR
$656M
| $1.99M | ﹤0.01% |
451,800
+231,400
| +105% | +$893K |
|
2359
CALL
Belden
BDC
$4B
| $1.99M | ﹤0.01% |
25,700
+21,400
| +498% | +$1.59M |
|
2360
Edison International
EIX
$30.7B
| $1.99M | ﹤0.01% |
27,767
+19,345
| +230% | +$1.27M |
|
2361
CALL
Navios Maritime Partners
NMM
$2.25B
| $1.99M | ﹤0.01% |
71,000
-8,100
| -10% | -$195K |
|
2362
CALL
HF Sinclair
DINO
$15.9B
| $1.98M | ﹤0.01% |
35,700
+17,000
| +91% | +$927K |
|
|
ACLX
2363
PUT
DELISTED
Arcellx
ACLX
| $1.98M | ﹤0.01% |
+35,700
| New | +$1.61M |
|
2364
CALL
Helmerich & Payne
HP
$3.53B
| $1.98M | ﹤0.01% |
54,700
+32,600
| +148% | +$1.26M |
|
2365
CALL
Westrock Coffee
WEST
$741M
| $1.98M | ﹤0.01% |
194,000
+40,400
| +26% | +$361K |
|
|
INBX
2366
CALL
DELISTED
Inhibrx, Inc. Common Stock
INBX
| $1.98M | ﹤0.01% |
+52,000
| New | +$1.11M |
|
2367
PUT
Altimmune
ALT
$539M
| $1.98M | ﹤0.01% |
175,600
+106,200
| +153% | +$443K |
|
2368
CALL
Corsair Gaming
CRSR
$1.05B
| $1.98M | ﹤0.01% |
140,100
-18,000
| -11% | -$241K |
|
|
HIVE
2369
CALL
HIVE Digital Technologies
HIVE
$792M
| $1.97M | ﹤0.01% |
435,900
+340,700
| +358% | +$1.16M |
|
2370
Direxion Daily Small Cap Bear 3x ETF
TZA
$213M
| $1.97M | ﹤0.01% |
+9,899
| New | +$2.96M |
|
|
SMAR
2371
PUT
DELISTED
Smartsheet Inc.
SMAR
| $1.97M | ﹤0.01% |
41,300
+14,000
| +51% | +$597K |
|
|
PPL
2372
CALL
PPL Corp
PPL
$27.3B
| $1.97M | ﹤0.01% |
72,700
+27,600
| +61% | +$700K |
|
2373
PUT
Sweetgreen
SG
$713M
| $1.96M | ﹤0.01% |
173,700
-62,200
| -26% | -$655K |
|
|
SGI
2374
CALL
Somnigroup International
SGI
$15.1B
| $1.96M | ﹤0.01% |
38,500
+23,700
| +160% | +$1.01M |
|
2375
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$247M
| $1.94M | ﹤0.01% |
+59,470
| New | +$2.08M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.