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 | |
|---|---|---|---|---|---|---|
5526
CALL
Ryan Specialty Holdings
RYAN
$5.86B
| $74K | ﹤0.01% |
1,100
-600
| -35% | -$41.4K |
|
5527
Sphere Entertainment
SPHR
$5.2B
| $74K | ﹤0.01% |
1,782
-17,247
| -91% | -$584K |
|
5528
PUT
Wolverine World Wide
WWW
$1.59B
| $74K | ﹤0.01% |
4,100
-100
| -2% | -$1.52K |
|
|
MRX
5529
PUT
Marex Group Limited Ordinary Shares
MRX
$4.7B
| $74K | ﹤0.01% |
1,900
+200
| +12% | +$8.33K |
|
5530
CALL
Cadiz
CDZI
$258M
| $73K | ﹤0.01% |
24,700
-67,700
| -73% | -$194K |
|
5531
PUT
Donnelley Financial Solutions
DFIN
$1.18B
| $73K | ﹤0.01% |
1,200
| – | – |
|
5532
Dream Finders Homes
DFH
$1.19B
| $73K | ﹤0.01% |
2,931
+975
| +50% | +$21.9K |
|
5533
First Bancorp
FNLC
$391M
| $73K | ﹤0.01% |
+2,894
| New | +$70.2K |
|
5534
Gulfport Energy Corp
GPOR
$2.85B
| $73K | ﹤0.01% |
+363
| New | +$67.7K |
|
5535
PUT
HUTCHMED
HCM
$1.91B
| $73K | ﹤0.01% |
4,900
+1,000
| +26% | +$14.6K |
|
5536
Hartford Financial Services
HIG
$39.3B
| $73K | ﹤0.01% |
+582
| New | +$72.3K |
|
|
OPLN
5537
PUT
Openlane
OPLN
$4.19B
| $73K | ﹤0.01% |
3,000
+2,900
| +2,900% | +$61.2K |
|
5538
LoveSac
LOVE
$236M
| $73K | ﹤0.01% |
4,052
+2,372
| +141% | +$45K |
|
5539
Nuvation Bio
NUVB
$2.23B
| $73K | ﹤0.01% |
37,654
+26,707
| +244% | +$55.6K |
|
5540
CALL
Omnicell
OMCL
$1.63B
| $73K | ﹤0.01% |
2,500
-5,200
| -68% | -$156K |
|
5541
PUT
Sana Biotechnology
SANA
$871M
| $73K | ﹤0.01% |
27,100
-13,200
| -33% | -$27.2K |
|
5542
CALL
Sasol
SSL
$7.46B
| $73K | ﹤0.01% |
16,600
-22,400
| -57% | -$91.7K |
|
5543
CALL
Twist Bioscience
TWST
$5.56B
| $73K | ﹤0.01% |
2,000
-1,000
| -33% | -$34.5K |
|
5544
US Gold Corp
USAU
$212M
| $73K | ﹤0.01% |
+6,052
| New | +$66.7K |
|
|
5545
PUT
US Gold Corp
USAU
$212M
| $73K | ﹤0.01% |
6,000
+5,700
| +1,900% | +$62.8K |
|
5546
CALL
VistaGen Therapeutics
VTGN
$9.79M
| $73K | ﹤0.01% |
36,900
+35,800
| +3,255% | +$81.3K |
|
5547
CALL
Watts Water Technologies
WTS
$11.6B
| $73K | ﹤0.01% |
+300
| New | +$67.5K |
|
|
5548
PUT
Watts Water Technologies
WTS
$11.6B
| $73K | ﹤0.01% |
300
+100
| +50% | +$22.5K |
|
|
WTMY
5549
CALL
WisdomTree High Income Laddered Municipal Fund
WTMY
$5.01M
| $73K | ﹤0.01% |
+3,000
| New | +$74.5K |
|
|
BLCN
5550
CALL
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
| $72K | ﹤0.01% |
+3,100
| New | +$64K |
|
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.