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 | |
|---|---|---|---|---|---|---|
|
CALY
4451
PUT
Callaway Golf Company
CALY
$3.28B
| $208K | ﹤0.01% |
25,900
-79,100
| -75% | -$544K |
|
4452
CALL
SoundThinking
SSTI
$108M
| $208K | ﹤0.01% |
16,000
-7,400
| -32% | -$115K |
|
4453
PUT
Amcor
AMCR
$21.2B
| $207K | ﹤0.01% |
4,520
+3,520
| +352% | +$162K |
|
4454
APi Group
APG
$16.7B
| $207K | ﹤0.01% |
+6,089
| New | +$174K |
|
4455
PUT
Strive Inc
ASST
$930M
| $207K | ﹤0.01% |
+2,765
| New | +$224K |
|
4456
Compass Diversified
CODI
$752M
| $207K | ﹤0.01% |
+33,009
| New | +$367K |
|
4457
CALL
Evolution Petroleum
EPM
$133M
| $207K | ﹤0.01% |
44,200
-53,800
| -55% | -$244K |
|
4458
Warrior Met Coal
HCC
$4.17B
| $207K | ﹤0.01% |
4,525
-3,191
| -41% | -$148K |
|
4459
PUT
NewMarket
NEU
$7.24B
| $207K | ﹤0.01% |
+300
| New | +$186K |
|
|
SF
4460
PUT
Stifel
SF
$12.4B
| $207K | ﹤0.01% |
3,000
-22,950
| -88% | -$1.41M |
|
|
TGNA
4461
DELISTED
TEGNA Inc
TGNA
| $207K | ﹤0.01% |
12,383
-46,682
| -79% | -$776K |
|
4462
CALL
Vitesse Energy
VTS
$644M
| $207K | ﹤0.01% |
9,400
-4,600
| -33% | -$101K |
|
4463
American Financial Group
AFG
$11.9B
| $206K | ﹤0.01% |
1,640
-5,016
| -75% | -$628K |
|
4464
Brookfield Asset Management
BAM
$75.6B
| $206K | ﹤0.01% |
+3,729
| New | +$200K |
|
4465
CALL
Cognyte Software
CGNT
$655M
| $206K | ﹤0.01% |
22,300
+11,800
| +112% | +$116K |
|
4466
PUT
Krystal Biotech
KRYS
$10.7B
| $206K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$206K |
|
|
LX
4467
PUT
LexinFintech Holdings
LX
$246M
| $206K | ﹤0.01% |
28,600
-266,000
| -90% | -$2.06M |
|
4468
Quantum-Si Incorporated
QSI
$153M
| $206K | ﹤0.01% |
105,534
+62,625
| +146% | +$92.6K |
|
4469
Rekor Systems
REKR
$82.6M
| $206K | ﹤0.01% |
177,769
+152,385
| +600% | +$160K |
|
4470
Vanguard FTSE Developed Markets ETF
VEA
$223B
| $206K | ﹤0.01% |
3,614
-80,341
| -96% | -$4.3M |
|
|
TXNM
4471
TXNM Energy Inc
TXNM
$6.39B
| $206K | ﹤0.01% |
+3,663
| New | +$199K |
|
4472
CALL
Clarivate
CLVT
$1.37B
| $205K | ﹤0.01% |
47,700
+7,000
| +17% | +$28.2K |
|
4473
CALL
Customers Bancorp
CUBI
$2.66B
| $205K | ﹤0.01% |
3,500
+800
| +30% | +$40.5K |
|
4474
Direxion Daily Financial Bear 3x ETF
FAZ
$85.8M
| $205K | ﹤0.01% |
4,684
-2,543
| -35% | -$136K |
|
4475
CALL
Sigma Lithium
SGML
$1.05B
| $205K | ﹤0.01% |
45,700
-20,300
| -31% | -$134K |
|
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.