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 | |
|---|---|---|---|---|---|---|
1401
Hilton Worldwide
HLT
$74.1B
| $4.67M | ﹤0.01% |
17,550
+15,137
| +627% | +$3.6M |
|
1402
PUT
Cipher Digital
CIFR
$9.74B
| $4.67M | ﹤0.01% |
977,700
+584,200
| +148% | +$1.89M |
|
1403
CALL
Symbotic
SYM
$5.07B
| $4.67M | ﹤0.01% |
120,300
-42,700
| -26% | -$1.12M |
|
1404
PUT
Annaly Capital Management
NLY
$16.8B
| $4.66M | ﹤0.01% |
247,700
+81,400
| +49% | +$1.55M |
|
1405
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $4.66M | ﹤0.01% |
78,000
-32,600
| -29% | -$1.51M |
|
1406
PUT
Arbor Realty Trust
ABR
$970M
| $4.66M | ﹤0.01% |
435,100
-300,700
| -41% | -$3.17M |
|
1407
PUT
Parsons
PSN
$6.37B
| $4.65M | ﹤0.01% |
64,800
+16,500
| +34% | +$1.09M |
|
1408
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $4.64M | ﹤0.01% |
95,100
+74,700
| +366% | +$2.64M |
|
1409
CALL
SL Green Realty
SLG
$3.91B
| $4.64M | ﹤0.01% |
74,900
+16,700
| +29% | +$956K |
|
1410
PUT
Ultragenyx Pharmaceutical
RARE
$2.63B
| $4.63M | ﹤0.01% |
127,500
+87,500
| +219% | +$3.15M |
|
1411
CALL
Steel Dynamics
STLD
$35.5B
| $4.63M | ﹤0.01% |
36,200
-53,100
| -59% | -$6.78M |
|
1412
CALL
Comstock Resources
CRK
$4.01B
| $4.62M | ﹤0.01% |
166,900
-131,200
| -44% | -$2.99M |
|
1413
CALL
Cboe Global Markets
CBOE
$29.6B
| $4.62M | ﹤0.01% |
19,800
-10,900
| -36% | -$2.43M |
|
1414
CALL
Fulgent Genetics
FLGT
$561M
| $4.62M | ﹤0.01% |
232,200
+218,000
| +1,535% | +$4.25M |
|
1415
CALL
abrdn Physical Gold Shares ETF
SGOL
$6.92B
| $4.61M | ﹤0.01% |
146,300
-4,400
| -3% | -$138K |
|
1416
PUT
BILL Holdings
BILL
$4.34B
| $4.61M | ﹤0.01% |
99,700
-72,100
| -42% | -$3.19M |
|
|
1417
PUT
Symbotic
SYM
$5.07B
| $4.61M | ﹤0.01% |
118,700
-21,300
| -15% | -$558K |
|
|
VISN
1418
PUT
Vistance Networks Inc
VISN
$2.66B
| $4.61M | ﹤0.01% |
556,700
+140,800
| +34% | +$737K |
|
1419
CALL
Agree Realty
ADC
$9.72B
| $4.6M | ﹤0.01% |
63,000
-5,500
| -8% | -$413K |
|
1420
PUT
Energy Fuels
UUUU
$2.85B
| $4.6M | ﹤0.01% |
799,800
+360,300
| +82% | +$1.73M |
|
1421
PUT
Corcept Therapeutics
CORT
$10.2B
| $4.59M | ﹤0.01% |
62,600
-113,100
| -64% | -$8.2M |
|
1422
YieldMax MSTR Option Income Strategy ETF
MSTY
$717M
| $4.58M | ﹤0.01% |
41,338
+16,776
| +68% | +$1.84M |
|
1423
CALL
Bunge Global
BG
$23.7B
| $4.58M | ﹤0.01% |
57,000
-77,800
| -58% | -$6.12M |
|
1424
CALL
Transmedics
TMDX
$2.45B
| $4.57M | ﹤0.01% |
34,100
-25,800
| -43% | -$2.83M |
|
|
JPGE
1425
CALL
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $4.57M | ﹤0.01% |
80,000
+22,000
| +38% | +$1.26M |
|
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.