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 | |
|---|---|---|---|---|---|---|
7201
PUT
Tompkins Financial
TMP
$1.42B
| $7.25K | ﹤0.01% |
+100
| New | +$6.86K |
|
|
AFCG
7202
AFC Gamma
AFCG
$60.9M
| $7.24K | ﹤0.01% |
+2,542
| New | +$8.07K |
|
7203
CALL
Oppenheimer Holdings
OPY
$1.18B
| $7.23K | ﹤0.01% |
+100
| New | +$6.96K |
|
7204
PUT
Cabaletta Bio
CABA
$427M
| $7.23K | ﹤0.01% |
3,300
+2,200
| +200% | +$5.45K |
|
7205
YieldMax MRNA Option Income Strategy ETF
MRNY
$106M
| $7.22K | ﹤0.01% |
491
+454
| +1,227% | +$7.26K |
|
7206
CALL
Cellebrite
CLBT
$3.76B
| $7.21K | ﹤0.01% |
400
-6,500
| -94% | -$117K |
|
7207
CALL
eGain
EGAN
$186M
| $7.2K | ﹤0.01% |
700
+200
| +40% | +$2.39K |
|
|
7208
PUT
eGain
EGAN
$186M
| $7.2K | ﹤0.01% |
700
-4,200
| -86% | -$50.2K |
|
|
GIFI
7209
PUT
DELISTED
Gulf Island Fabrication
GIFI
| $7.18K | ﹤0.01% |
+600
| New | +$6.04K |
|
7210
CALL
Sensus Healthcare
SRTS
$46.9M
| $7.16K | ﹤0.01% |
1,800
-700
| -28% | -$2.59K |
|
7211
CALL
IPG Photonics
IPGP
$3.4B
| $7.16K | ﹤0.01% |
100
-700
| -88% | -$57.1K |
|
7212
MarineMax
HZO
$748M
| $7.15K | ﹤0.01% |
295
-2,291
| -89% | -$56.5K |
|
7213
1stdibs.com
DIBS
$148M
| $7.13K | ﹤0.01% |
+1,191
| New | +$5.36K |
|
7214
PUT
Pyxis Oncology
PYXS
$185M
| $7.13K | ﹤0.01% |
+6,200
| New | +$21.9K |
|
|
ARDT
7215
CALL
Ardent Health
ARDT
$1.57B
| $7.06K | ﹤0.01% |
800
-9,300
| -92% | -$108K |
|
7216
CALL
John B. Sanfilippo & Son
JBSS
$986M
| $7.06K | ﹤0.01% |
100
-2,400
| -96% | -$163K |
|
|
7217
PUT
John B. Sanfilippo & Son
JBSS
$986M
| $7.06K | ﹤0.01% |
100
-400
| -80% | -$27.2K |
|
7218
PUT
Orchestra BioMed
OBIO
$228M
| $7.05K | ﹤0.01% |
+1,700
| New | +$6.86K |
|
7219
CALL
Clarus
CLAR
$125M
| $7.04K | ﹤0.01% |
+2,100
| New | +$7.15K |
|
7220
ProShares VIX Short-Term Futures ETF
VIXY
$221M
| $7.03K | ﹤0.01% |
274
-4,650
| -94% | -$148K |
|
|
FBRT
7221
CALL
Franklin BSP Realty Trust
FBRT
$580M
| $7.02K | ﹤0.01% |
700
-4,800
| -87% | -$50.1K |
|
7222
Cricut
CRCT
$1.01B
| $6.99K | ﹤0.01% |
1,413
-113
| -7% | -$577 |
|
7223
iShares MSCI India Small-Cap ETF
SMIN
$750M
| $6.99K | ﹤0.01% |
100
+90
| +900% | +$6.5K |
|
|
CIO
7224
CALL
DELISTED
City Office REIT
CIO
| $6.99K | ﹤0.01% |
1,000
-1,400
| -58% | -$9.69K |
|
7225
Direxion Daily Pharmaceutical & Medical Bull 3X ETF
PILL
$21.5M
| $6.96K | ﹤0.01% |
+566
| New | +$5.67K |
|
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.