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 | |
|---|---|---|---|---|---|---|
701
CALL
BILL Holdings
BILL
$4.09B
| $13.4M | 0.01% |
245,300
-55,800
| -19% | -$2.87M |
|
702
CALL
American International
AIG
$41.7B
| $13.3M | 0.01% |
155,900
+26,300
| +20% | +$2.1M |
|
703
Micron Technology
MU
$1.11T
| $13.3M | 0.01% |
46,589
-185,024
| -80% | -$42.5M |
|
704
CALL
Tapestry
TPR
$28.5B
| $13.3M | 0.01% |
103,800
-65,300
| -39% | -$7.46M |
|
705
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$707M
| $13.3M | 0.01% |
205,900
-28,500
| -12% | -$1.44M |
|
706
Goldman Sachs
GS
$314B
| $13.3M | 0.01% |
+15,075
| New | +$12.3M |
|
707
PUT
Tilray
TLRY
$489M
| $13.2M | 0.01% |
1,462,600
+1,309,900
| +858% | +$16M |
|
708
PUT
Li Auto
LI
$12.1B
| $13.2M | 0.01% |
779,900
-16,900
| -2% | -$335K |
|
709
CALL
Liquidia Corp
LQDA
$7.73B
| $13.2M | 0.01% |
382,100
-202,100
| -35% | -$5.75M |
|
710
CALL
Nucor
NUE
$54.7B
| $13.2M | 0.01% |
80,700
-24,600
| -23% | -$3.7M |
|
711
CALL
Deckers Outdoor
DECK
$13.9B
| $13.2M | 0.01% |
126,900
+700
| +0.6% | +$65.6K |
|
712
CALL
VF Corp
VFC
$6.51B
| $13.1M | 0.01% |
726,600
-4,500
| -0.6% | -$72.9K |
|
713
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $13.1M | 0.01% |
608,000
+60,600
| +11% | +$1.28M |
|
714
Mercado Libre
MELI
$90B
| $13.1M | 0.01% |
6,495
+2,435
| +60% | +$5.11M |
|
|
JBS
715
CALL
JBS N.V.
JBS
$39.6B
| $13.1M | 0.01% |
906,200
+254,900
| +39% | +$3.5M |
|
716
CALL
Coeur Mining
CDE
$15.5B
| $13.1M | 0.01% |
732,700
-79,400
| -10% | -$1.38M |
|
717
PUT
Agnico Eagle Mines
AEM
$71.5B
| $13M | 0.01% |
76,700
-50,600
| -40% | -$8.51M |
|
718
CALL
Schwab US Broad Market ETF
SCHB
$42.6B
| $13M | 0.01% |
466,200
-36,000
| -7% | -$937K |
|
719
PUT
GSK
GSK
$102B
| $12.9M | 0.01% |
264,000
-6,500
| -2% | -$303K |
|
720
PUT
Colgate-Palmolive
CL
$72.2B
| $12.9M | 0.01% |
163,400
+41,100
| +34% | +$3.22M |
|
721
CALL
Marathon Petroleum
MPC
$91.6B
| $12.9M | 0.01% |
79,200
+19,500
| +33% | +$3.65M |
|
722
CALL
Toast
TOST
$16.5B
| $12.9M | 0.01% |
362,400
-219,500
| -38% | -$7.91M |
|
723
PUT
Bilibili
BILI
$7.25B
| $12.9M | 0.01% |
522,900
-75,800
| -13% | -$2.04M |
|
724
PUT
Southern Company
SO
$109B
| $12.8M | 0.01% |
147,200
+13,300
| +10% | +$1.21M |
|
725
CALL
BP
BP
$114B
| $12.8M | 0.01% |
368,400
-234,000
| -39% | -$8.21M |
|
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.