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 | |
|---|---|---|---|---|---|---|
1876
PUT
Blue Owl Capital
OWL
$6.39B
| $2.63M | ﹤0.01% |
136,900
-36,500
| -21% | -$675K |
|
1877
PUT
Stratasys
SSYS
$697M
| $2.62M | ﹤0.01% |
228,400
-18,800
| -8% | -$191K |
|
1878
CALL
Brighthouse Financial
BHF
$3.63B
| $2.62M | ﹤0.01% |
48,700
-24,900
| -34% | -$1.4M |
|
1879
CALL
Global X S&P 500 Tail Risk ETF
XTR
$4.77M
| $2.62M | ﹤0.01% |
47,500
+33,400
| +237% | +$889K |
|
|
ARI
1880
PUT
Apollo Commercial Real Estate
ARI
$887M
| $2.61M | ﹤0.01% |
269,300
-4,100
| -1% | -$38.6K |
|
1881
BJs Wholesale Club
BJ
$11.9B
| $2.6M | ﹤0.01% |
24,081
+15,812
| +191% | +$1.8M |
|
1882
PUT
Globalstar
GSAT
$10.2B
| $2.6M | ﹤0.01% |
110,200
-89,200
| -45% | -$1.8M |
|
1883
CALL
Paycom
PAYC
$6.78B
| $2.59M | ﹤0.01% |
11,200
+5,800
| +107% | +$1.38M |
|
1884
CALL
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $2.59M | ﹤0.01% |
12,300
-5,500
| -31% | -$343K |
|
1885
CALL
Welltower
WELL
$178B
| $2.58M | ﹤0.01% |
16,800
-38,300
| -70% | -$5.72M |
|
1886
CALL
monday.com
MNDY
$3.27B
| $2.58M | ﹤0.01% |
8,200
-25,800
| -76% | -$7.18M |
|
1887
CALL
Biohaven
BHVN
$2.16B
| $2.57M | ﹤0.01% |
182,200
+154,600
| +560% | +$2.76M |
|
1888
PUT
Alliance Resource Partners
ARLP
$3.18B
| $2.56M | ﹤0.01% |
98,000
+8,500
| +9% | +$223K |
|
1889
Mirion Technologies
MIR
$4.05B
| $2.56M | ﹤0.01% |
118,949
+87,579
| +279% | +$1.51M |
|
|
CDTX
1890
CALL
DELISTED
Cidara Therapeutics
CDTX
| $2.56M | ﹤0.01% |
52,500
+50,700
| +2,817% | +$1.22M |
|
1891
CALL
Viking Holdings
VIK
$44.9B
| $2.56M | ﹤0.01% |
48,000
+37,800
| +371% | +$1.67M |
|
1892
PUT
KeyCorp
KEY
$24.3B
| $2.56M | ﹤0.01% |
146,700
-64,500
| -31% | -$1M |
|
1893
CALL
Virgin Galactic
SPCE
$320M
| $2.55M | ﹤0.01% |
964,300
+237,100
| +33% | +$726K |
|
1894
CALL
XPO
XPO
$25B
| $2.55M | ﹤0.01% |
20,200
-18,400
| -48% | -$2.06M |
|
1895
CALL
IAMGOLD
IAG
$8.47B
| $2.55M | ﹤0.01% |
347,000
+210,700
| +155% | +$1.48M |
|
1896
Norfolk Southern
NSC
$78.8B
| $2.55M | ﹤0.01% |
9,961
+7,621
| +326% | +$1.8M |
|
1897
PUT
Capri Holdings
CPRI
$1.77B
| $2.55M | ﹤0.01% |
143,900
-279,700
| -66% | -$4.61M |
|
1898
CALL
FIGS
FIGS
$1.59B
| $2.54M | ﹤0.01% |
450,400
-104,000
| -19% | -$480K |
|
1899
PUT
Liquidia Corp
LQDA
$7.67B
| $2.54M | ﹤0.01% |
203,900
+163,400
| +403% | +$2.42M |
|
1900
UroGen Pharma
URGN
$2B
| $2.53M | ﹤0.01% |
185,030
+184,698
| +55,632% | +$1.77M |
|
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.