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 | |
|---|---|---|---|---|---|---|
2826
PUT
Root
ROOT
$945M
| $816K | ﹤0.01% |
11,300
-2,700
| -19% | -$215K |
|
2827
PUT
Huntsman Corp
HUN
$2.12B
| $815K | ﹤0.01% |
81,500
-96,700
| -54% | -$885K |
|
2828
PUT
Alcon
ALC
$33.2B
| $812K | ﹤0.01% |
10,300
-4,700
| -31% | -$362K |
|
2829
PUT
Northern Oil and Gas
NOG
$2.22B
| $812K | ﹤0.01% |
37,800
+2,100
| +6% | +$47.1K |
|
2830
PUT
Sherwin-Williams
SHW
$80B
| $810K | ﹤0.01% |
2,500
-9,600
| -79% | -$3.21M |
|
2831
Elanco Animal Health
ELAN
$12.8B
| $808K | ﹤0.01% |
+35,698
| New | +$777K |
|
2832
PUT
FIGS
FIGS
$1.63B
| $808K | ﹤0.01% |
71,100
+70,500
| +11,750% | +$660K |
|
2833
PUT
Global X MSCI Norway ETF
NORW
$85.2M
| $806K | ﹤0.01% |
8,900
+900
| +11% | +$26.4K |
|
2834
PUT
Sigma Lithium
SGML
$1.09B
| $806K | ﹤0.01% |
61,100
-223,700
| -79% | -$1.93M |
|
2835
CALL
Sportradar
SRAD
$4.37B
| $806K | ﹤0.01% |
33,900
-65,000
| -66% | -$1.56M |
|
|
TGB
2836
CALL
Trekor Metals
TGB
$2.53B
| $805K | ﹤0.01% |
142,200
+64,300
| +83% | +$303K |
|
2837
PUT
Liquidia Corp
LQDA
$7.81B
| $804K | ﹤0.01% |
23,300
-142,800
| -86% | -$4.07M |
|
2838
PUT
Remitly
RELY
$4.77B
| $803K | ﹤0.01% |
58,200
+35,200
| +153% | +$511K |
|
|
ONIT
2839
Onity Group
ONIT
$340M
| $803K | ﹤0.01% |
17,532
+4,188
| +31% | +$172K |
|
2840
Hormel Foods
HRL
$14.3B
| $803K | ﹤0.01% |
33,866
-14,136
| -29% | -$330K |
|
2841
PUT
Legend Biotech
LEGN
$3.65B
| $800K | ﹤0.01% |
36,800
+14,800
| +67% | +$424K |
|
2842
PUT
Immunome
IMNM
$2.61B
| $799K | ﹤0.01% |
37,200
+26,400
| +244% | +$463K |
|
2843
PUT
W.P. Carey
WPC
$17.1B
| $799K | ﹤0.01% |
13,300
-34,500
| -72% | -$2.3M |
|
2844
Viking Holdings
VIK
$45.5B
| $798K | ﹤0.01% |
+11,177
| New | +$713K |
|
2845
Sunoco
SUN
$14B
| $797K | ﹤0.01% |
+15,199
| New | +$803K |
|
2846
CALL
Brown-Forman Class B
BF.B
$12.2B
| $796K | ﹤0.01% |
30,400
+100
| +0.3% | +$2.81K |
|
2847
CALL
InterDigital
IDCC
$6.61B
| $796K | ﹤0.01% |
2,500
-1,700
| -40% | -$601K |
|
2848
CALL
Unusual Machines
UMAC
$949M
| $795K | ﹤0.01% |
62,400
-91,600
| -59% | -$1.07M |
|
2849
PUT
Alkermes
ALKS
$8.89B
| $795K | ﹤0.01% |
28,400
+3,000
| +12% | +$89.9K |
|
2850
PUT
Dave & Buster's
PLAY
$352M
| $794K | ﹤0.01% |
49,000
+3,900
| +9% | +$65.2K |
|
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.