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 | |
|---|---|---|---|---|---|---|
5976
CALL
Movado Group
MOV
$849M
| $35.1K | ﹤0.01% |
1,700
| – | – |
|
5977
iShare MSCI Eurozone ETF
EZU
$9.64B
| $35K | ﹤0.01% |
+546
| New | +$34.2K |
|
5978
PUT
Belden
BDC
$4.85B
| $35K | ﹤0.01% |
+300
| New | +$35K |
|
|
FIRY
5979
CALL
Firy Inc
FIRY
$148M
| $34.9K | ﹤0.01% |
8,100
+1,400
| +21% | +$8.65K |
|
5980
CALL
Payoneer
PAYO
$2.42B
| $34.8K | ﹤0.01% |
6,200
+200
| +3% | +$1.16K |
|
5981
PMV Pharmaceuticals
PMVP
$59.2M
| $34.8K | ﹤0.01% |
27,862
+7,121
| +34% | +$9.54K |
|
5982
Silgan Holdings
SLGN
$4.23B
| $34.8K | ﹤0.01% |
862
+809
| +1,526% | +$32.8K |
|
5983
Apyx Medical
APYX
$173M
| $34.8K | ﹤0.01% |
9,934
+5,347
| +117% | +$18.6K |
|
5984
PUT
Arhaus
ARHS
$1.05B
| $34.8K | ﹤0.01% |
3,100
+600
| +24% | +$6.23K |
|
5985
PUT
Exponent
EXPO
$3.24B
| $34.7K | ﹤0.01% |
500
+400
| +400% | +$28.1K |
|
5986
PUT
ITT
ITT
$17.5B
| $34.7K | ﹤0.01% |
200
+100
| +100% | +$17.9K |
|
5987
Clean Energy Fuels
CLNE
$427M
| $34.7K | ﹤0.01% |
16,522
-92,861
| -85% | -$227K |
|
5988
CALL
Manhattan Associates
MANH
$11.2B
| $34.7K | ﹤0.01% |
200
-200
| -50% | -$36.6K |
|
5989
CALL
Vishay Precision Group
VPG
$1.22B
| $34.6K | ﹤0.01% |
900
-4,400
| -83% | -$156K |
|
5990
PUT
Workiva
WK
$3.36B
| $34.5K | ﹤0.01% |
400
-100
| -20% | -$8.85K |
|
5991
CALL
Roundhill Ball Metaverse ETF
METV
$209M
| $34.5K | ﹤0.01% |
1,200
+600
| +100% | +$11.9K |
|
5992
PUT
Wheels Up
UP
$208M
| $34.5K | ﹤0.01% |
2,625
-3,505
| -57% | -$79.9K |
|
5993
PUT
APi Group
APG
$17.1B
| $34.4K | ﹤0.01% |
900
| – | – |
|
5994
CALL
Telefônica Brasil
VIV
$20.6B
| $34.4K | ﹤0.01% |
2,900
+1,700
| +142% | +$21.1K |
|
5995
YieldMax COIN Option Income Strategy ETF
CONY
$320M
| $34.4K | ﹤0.01% |
874
-3,563
| -80% | -$196K |
|
5996
PUT
Ternium
TX
$9.67B
| $34.4K | ﹤0.01% |
900
+500
| +125% | +$18.4K |
|
5997
CALL
Civeo
CVEO
$345M
| $34.3K | ﹤0.01% |
+1,500
| New | +$33.3K |
|
5998
PUT
QuidelOrtho
QDEL
$1.14B
| $34.3K | ﹤0.01% |
1,200
-1,600
| -57% | -$43.3K |
|
|
NVX
5999
NOVONIX
NVX
$99M
| $34.2K | ﹤0.01% |
+33,884
| New | +$48.1K |
|
6000
Phibro Animal Health
PAHC
$1.47B
| $34.2K | ﹤0.01% |
915
+535
| +141% | +$21.7K |
|
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.