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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5276
PUT
Highwoods Properties
HIW
$3.73B
| $96K | ﹤0.01% |
3,100
-1,000
| -24% | -$29.4K |
|
5277
CALL
Immunic
IMUX
$191M
| $96K | ﹤0.01% |
+13,850
| New | +$127K |
|
5278
Kimco Realty
KIM
$17.2B
| $96K | ﹤0.01% |
+4,605
| New | +$95.5K |
|
5279
CALL
Alliant Energy
LNT
$18.3B
| $96K | ﹤0.01% |
1,600
+1,400
| +700% | +$85.7K |
|
|
MODV
5280
PUT
DELISTED
ModivCare
MODV
| $96K | ﹤0.01% |
30,900
-17,100
| -36% | -$31.5K |
|
5281
CALL
ProQR Therapeutics
PRQR
$251M
| $96K | ﹤0.01% |
47,300
+36,800
| +350% | +$59.9K |
|
5282
Universal Health Services
UHS
$9.88B
| $96K | ﹤0.01% |
+535
| New | +$96.5K |
|
|
ONC
5283
PUT
BeOne Medicines Ltd
ONC
$33.4B
| $96K | ﹤0.01% |
400
-1,000
| -71% | -$245K |
|
|
VOYG
5284
Voyager Technologies
VOYG
$1.42B
| $96K | ﹤0.01% |
+2,447
| New | +$117K |
|
5285
CALL
Avnet
AVT
$7.12B
| $95K | ﹤0.01% |
1,800
+1,400
| +350% | +$69.5K |
|
5286
CALL
Butterfly Network
BFLY
$2.18B
| $95K | ﹤0.01% |
47,700
-15,300
| -24% | -$35.1K |
|
5287
CALL
Buckle
BKE
$2.27B
| $95K | ﹤0.01% |
2,100
+1,000
| +91% | +$39.5K |
|
|
CMCM
5288
PUT
Cheetah Mobile
CMCM
$88.5M
| $95K | ﹤0.01% |
+20,400
| New | +$82.2K |
|
5289
PUT
Columbia Banking Systems
COLB
$8.84B
| $95K | ﹤0.01% |
4,100
+1,600
| +64% | +$37.1K |
|
|
EWCZ
5290
CALL
DELISTED
European Wax Center
EWCZ
| $95K | ﹤0.01% |
16,900
+5,400
| +47% | +$24.5K |
|
5291
PUT
Larimar Therapeutics
LRMR
$397M
| $95K | ﹤0.01% |
33,200
+18,500
| +126% | +$42.8K |
|
5292
CALL
Methanex
MEOH
$4.27B
| $95K | ﹤0.01% |
2,900
+1,100
| +61% | +$35.5K |
|
5293
CALL
National CineMedia
NCMI
$375M
| $95K | ﹤0.01% |
19,700
-32,200
| -62% | -$175K |
|
5294
CALL
Envista
NVST
$4.52B
| $95K | ﹤0.01% |
4,900
-500
| -9% | -$8.7K |
|
5295
CALL
Arcos Dorados Holdings
ARCO
$1.73B
| $94K | ﹤0.01% |
12,000
+6,600
| +122% | +$49.9K |
|
5296
CALL
CrossAmerica Partners
CAPL
$831M
| $94K | ﹤0.01% |
4,500
-900
| -17% | -$20.3K |
|
5297
Direxion Daily Real Estate Bull 3X ETF
DRN
$46.5M
| $94K | ﹤0.01% |
9,908
-7,263
| -42% | -$68K |
|
5298
Galectin Therapeutics
GALT
$213M
| $94K | ﹤0.01% |
44,694
+43,915
| +5,637% | +$65.7K |
|
5299
CALL
Graco
GGG
$13B
| $94K | ﹤0.01% |
1,100
+200
| +22% | +$16.6K |
|
5300
CALL
Green Brick Partners
GRBK
$3.02B
| $94K | ﹤0.01% |
1,500
+600
| +67% | +$35.6K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.