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 | |
|---|---|---|---|---|---|---|
|
UNIT
1776
PUT
Uniti Group
UNIT
$2.63B
| $2.58M | ﹤0.01% |
367,900
-9,300
| -2% | -$58.9K |
|
1777
CALL
Bank OZK
OZK
$5.49B
| $2.58M | ﹤0.01% |
56,000
-29,200
| -34% | -$1.37M |
|
1778
Black Hills Corp
BKH
$5.73B
| $2.57M | ﹤0.01% |
37,089
+24,702
| +199% | +$1.67M |
|
|
PPLT
1779
abrdn Physical Platinum Shares ETF
PPLT
$1.81B
| $2.56M | ﹤0.01% |
+137,550
| New | +$2.12M |
|
|
VG
1780
CALL
Venture Global Inc
VG
$35.6B
| $2.56M | ﹤0.01% |
375,200
+242,200
| +182% | +$2.02M |
|
1781
CALL
ING
ING
$93.8B
| $2.55M | ﹤0.01% |
91,100
+19,100
| +27% | +$492K |
|
1782
PUT
Beyond Meat
BYND
$288M
| $2.55M | ﹤0.01% |
3,106,300
+1,655,300
| +114% | +$2.3M |
|
1783
PUT
Copa Holdings
CPA
$5.56B
| $2.54M | ﹤0.01% |
21,100
+8,800
| +72% | +$1.08M |
|
1784
Genius Sports
GENI
$1.73B
| $2.54M | ﹤0.01% |
230,543
+39,303
| +21% | +$429K |
|
1785
Direxion Daily CSI China Internet Index Bull 2X ETF
CWEB
$218M
| $2.54M | ﹤0.01% |
63,335
-2,199
| -3% | -$106K |
|
1786
PUT
SharkNinja
SN
$21B
| $2.54M | ﹤0.01% |
22,700
-25,500
| -53% | -$2.51M |
|
1787
CALL
LPL Financial
LPLA
$26.3B
| $2.54M | ﹤0.01% |
7,100
+1,500
| +27% | +$531K |
|
1788
PUT
Aptiv
APTV
$12B
| $2.53M | ﹤0.01% |
33,300
-7,300
| -18% | -$586K |
|
1789
CALL
Summit Therapeutics
SMMT
$10.9B
| $2.53M | ﹤0.01% |
144,700
-75,600
| -34% | -$1.42M |
|
1790
Okta
OKTA
$24.1B
| $2.53M | ﹤0.01% |
29,260
-17,810
| -38% | -$1.55M |
|
1791
PUT
Iron Mountain
IRM
$38.2B
| $2.53M | ﹤0.01% |
30,500
+9,500
| +45% | +$889K |
|
1792
PUT
Exelon
EXC
$48.6B
| $2.53M | ﹤0.01% |
58,000
-300
| -0.5% | -$13.7K |
|
1793
CALL
Goodyear
GT
$2.07B
| $2.53M | ﹤0.01% |
288,400
+105,000
| +57% | +$827K |
|
1794
CALL
Travelers Companies
TRV
$80.8B
| $2.52M | ﹤0.01% |
8,700
-400
| -4% | -$113K |
|
1795
CALL
TG Therapeutics
TGTX
$8.58B
| $2.52M | ﹤0.01% |
84,500
-13,500
| -14% | -$441K |
|
1796
Hawaiian Electric Industries
HE
$2.33B
| $2.52M | ﹤0.01% |
204,670
+149,864
| +273% | +$1.74M |
|
1797
PUT
DigitalOcean
DOCN
$14.4B
| $2.52M | ﹤0.01% |
52,300
+12,500
| +31% | +$550K |
|
1798
CALL
Ingersoll Rand
IR
$33B
| $2.51M | ﹤0.01% |
31,700
+22,400
| +241% | +$1.77M |
|
1799
CALL
Brookfield Renewable
BEPC
$6.12B
| $2.51M | ﹤0.01% |
65,500
+20,000
| +44% | +$805K |
|
|
PMT
1800
PUT
PennyMac Mortgage Investment
PMT
$849M
| $2.5M | ﹤0.01% |
199,300
+192,500
| +2,831% | +$2.4M |
|
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.