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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2451
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.3M
| $1.2M | ﹤0.01% |
81,900
-510,700
| -86% | -$12.8M |
|
2452
Vanguard Information Technology ETF
VGT
$139B
| $1.2M | ﹤0.01% |
+12,768
| New | +$1.21M |
|
2453
CALL
Freshpet
FRPT
$2.83B
| $1.2M | ﹤0.01% |
19,700
-27,400
| -58% | -$1.55M |
|
2454
PUT
Goldman Sachs Access US Aggregate Bond ETF
GCOR
$791M
| $1.2M | ﹤0.01% |
22,700
+13,500
| +147% | +$564K |
|
2455
iShares MSCI EAFE ETF
EFA
$76.4B
| $1.2M | ﹤0.01% |
+12,489
| New | +$1.18M |
|
2456
CALL
Syndax Pharmaceuticals
SNDX
$1.84B
| $1.2M | ﹤0.01% |
57,000
-60,300
| -51% | -$1.05M |
|
2457
CALL
Molson Coors Class B
TAP
$7.68B
| $1.2M | ﹤0.01% |
25,600
-6,100
| -19% | -$281K |
|
2458
Euronet Worldwide
EEFT
$3.02B
| $1.19M | ﹤0.01% |
15,685
+10,316
| +192% | +$804K |
|
|
JBS
2459
JBS N.V.
JBS
$40.4B
| $1.19M | ﹤0.01% |
82,694
-60,286
| -42% | -$828K |
|
2460
PUT
SGHC Ltd
SGHC
$7.3B
| $1.19M | ﹤0.01% |
99,600
+50,900
| +105% | +$612K |
|
2461
Diageo
DEO
$46.2B
| $1.19M | ﹤0.01% |
13,781
+11,316
| +459% | +$1.04M |
|
2462
PUT
DHT Holdings
DHT
$2.97B
| $1.18M | ﹤0.01% |
96,800
+41,000
| +73% | +$516K |
|
|
NB
2463
CALL
NioCorp Developments
NB
$603M
| $1.18M | ﹤0.01% |
222,900
+15,900
| +8% | +$109K |
|
|
HI
2464
PUT
DELISTED
Hillenbrand
HI
| $1.18M | ﹤0.01% |
37,200
+37,100
| +37,100% | +$1.14M |
|
2465
PUT
Baxter International
BAX
$11.6B
| $1.18M | ﹤0.01% |
61,700
-37,200
| -38% | -$744K |
|
2466
Genesis Energy
GEL
$1.84B
| $1.18M | ﹤0.01% |
75,419
+57,092
| +312% | +$896K |
|
2467
CALL
Qorvo
QRVO
$7.63B
| $1.17M | ﹤0.01% |
13,900
+4,800
| +53% | +$424K |
|
2468
CALL
Simply Good Foods
SMPL
$904M
| $1.17M | ﹤0.01% |
58,500
+40,600
| +227% | +$845K |
|
2469
CALL
Planet Fitness
PLNT
$4.23B
| $1.17M | ﹤0.01% |
10,800
-10,700
| -50% | -$1.1M |
|
2470
CALL
Revolution Medicines
RVMD
$40.2B
| $1.17M | ﹤0.01% |
14,700
-4,300
| -23% | -$282K |
|
|
GTM
2471
CALL
ZoomInfo Technologies
GTM
$861M
| $1.17M | ﹤0.01% |
115,000
-57,900
| -33% | -$596K |
|
2472
PUT
EPAM Systems
EPAM
$4.69B
| $1.17M | ﹤0.01% |
5,700
-18,000
| -76% | -$3.21M |
|
2473
Sable Offshore Corp
SOC
$903M
| $1.17M | ﹤0.01% |
129,451
+89,076
| +221% | +$841K |
|
|
CIVI
2474
CALL
DELISTED
Civitas Resources
CIVI
| $1.17M | ﹤0.01% |
43,100
-29,200
| -40% | -$845K |
|
2475
CALL
Upwork
UPWK
$1.09B
| $1.17M | ﹤0.01% |
58,900
+43,800
| +290% | +$803K |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.