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 | Miscellaneous | 98.27% |
| 2 | Technology | 0.59% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1401
CALL
Tenet Healthcare
THC
$21.3B
| $4.27M | ﹤0.01% |
21,500
-12,700
| -37% | -$2.57M |
|
1402
PUT
Equinox Gold
EQX
$15B
| $4.26M | ﹤0.01% |
303,600
+135,900
| +81% | +$1.71M |
|
1403
PUT
Roivant Sciences
ROIV
$25.2B
| $4.26M | ﹤0.01% |
196,300
-104,700
| -35% | -$2.07M |
|
1404
CALL
Bit Digital
BTBT
$591M
| $4.26M | ﹤0.01% |
2,253,300
-350,200
| -13% | -$1.01M |
|
1405
Rivian
RIVN
$22.8B
| $4.26M | ﹤0.01% |
215,942
+85,770
| +66% | +$1.36M |
|
1406
PUT
Hawaiian Electric Industries
HE
$1.92B
| $4.25M | ﹤0.01% |
345,700
+113,400
| +49% | +$1.31M |
|
1407
CALL
Symbotic
SYM
$5.58B
| $4.25M | ﹤0.01% |
71,400
-112,900
| -61% | -$7.46M |
|
1408
CALL
Frontline
FRO
$10.3B
| $4.25M | ﹤0.01% |
194,600
-15,700
| -7% | -$367K |
|
1409
CALL
abrdn Physical Silver Shares ETF
SIVR
$4.48B
| $4.24M | ﹤0.01% |
62,700
+44,600
| +246% | +$2.34M |
|
1410
PUT
monday.com
MNDY
$3.85B
| $4.23M | ﹤0.01% |
28,700
-7,500
| -21% | -$1.26M |
|
|
PPL
1411
CALL
PPL Corp
PPL
$26.4B
| $4.23M | ﹤0.01% |
120,900
+11,500
| +11% | +$415K |
|
1412
PUT
Southern Copper
SCCO
$168B
| $4.23M | ﹤0.01% |
30,409
-50
| -0.2% | -$6.54K |
|
1413
PUT
Uranium Energy
UEC
$5.71B
| $4.23M | ﹤0.01% |
362,300
-281,500
| -44% | -$3.69M |
|
|
BULL
1414
PUT
Webull Corp
BULL
$5.26B
| $4.23M | ﹤0.01% |
544,100
-293,500
| -35% | -$2.95M |
|
1415
CALL
Novavax
NVAX
$1.69B
| $4.22M | ﹤0.01% |
628,500
-119,100
| -16% | -$898K |
|
1416
PUT
Celanese
CE
$4.9B
| $4.21M | ﹤0.01% |
99,600
-25,000
| -20% | -$1.02M |
|
|
SLVR
1417
Sprott Silver Miners & Physical Silver ETF
SLVR
$807M
| $4.21M | ﹤0.01% |
75,458
+68,872
| +1,046% | +$3.28M |
|
1418
PUT
T. Rowe Price
TROW
$23.4B
| $4.21M | ﹤0.01% |
41,100
-7,300
| -15% | -$753K |
|
|
EXE
1419
PUT
Expand Energy Corp
EXE
$22.7B
| $4.2M | ﹤0.01% |
44,700
-40,200
| -47% | -$4.46M |
|
|
GPGI
1420
PUT
GPGI Inc
GPGI
$3.95B
| $4.2M | ﹤0.01% |
218,000
-68,400
| -24% | -$1.36M |
|
1421
CALL
Woodward
WWD
$20.4B
| $4.2M | ﹤0.01% |
13,900
+12,400
| +827% | +$3.41M |
|
1422
PUT
Samsara
IOT
$23.4B
| $4.19M | ﹤0.01% |
118,300
-10,600
| -8% | -$410K |
|
1423
CALL
Celcuity
CELC
$4.68B
| $4.19M | ﹤0.01% |
42,000
+37,300
| +794% | +$3.07M |
|
1424
CALL
Globant
GLOB
$1.69B
| $4.18M | ﹤0.01% |
64,000
+36,800
| +135% | +$2.31M |
|
1425
PUT
LPL Financial
LPLA
$28.3B
| $4.18M | ﹤0.01% |
11,700
+3,100
| +36% | +$1.1M |
|
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's Q4 2025 filing shows 1,476 new, 2,599 increased, 4,088 reduced and 2,184 closed positions. Its largest new stake was Western Digital: 341,762 shares worth $58.9M. The largest sale was NVIDIA, an estimated $262M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.