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 | |
|---|---|---|---|---|---|---|
1951
PUT
Southern Copper
SCCO
$141B
| $2.38M | ﹤0.01% |
24,384
-556
| -2% | -$48.9K |
|
1952
PUT
Parker-Hannifin
PH
$125B
| $2.37M | ﹤0.01% |
3,400
| – | – |
|
1953
PUT
Williams-Sonoma
WSM
$26.7B
| $2.37M | ﹤0.01% |
14,500
-83,700
| -85% | -$13.1M |
|
1954
CALL
Core & Main
CNM
$8.17B
| $2.37M | ﹤0.01% |
39,200
-12,900
| -25% | -$690K |
|
1955
CALL
TPG
TPG
$6.87B
| $2.36M | ﹤0.01% |
45,000
+40,100
| +818% | +$1.92M |
|
1956
CALL
Idexx Laboratories
IDXX
$42.9B
| $2.36M | ﹤0.01% |
4,400
+800
| +22% | +$383K |
|
1957
PUT
Clean Harbors
CLH
$16.1B
| $2.36M | ﹤0.01% |
10,200
+300
| +3% | +$65.7K |
|
1958
CALL
Armstrong World Industries
AWI
$6.86B
| $2.35M | ﹤0.01% |
+14,500
| New | +$2.15M |
|
1959
PUT
Cboe Global Markets
CBOE
$29.8B
| $2.35M | ﹤0.01% |
10,100
-1,300
| -11% | -$289K |
|
1960
CALL
Clear Secure
YOU
$5.26B
| $2.35M | ﹤0.01% |
84,700
-26,800
| -24% | -$683K |
|
|
JBGS
1961
PUT
JBG SMITH
JBGS
$846M
| $2.35M | ﹤0.01% |
135,700
+131,400
| +3,056% | +$2.14M |
|
1962
PUT
Flutter Entertainment
FLUT
$17.6B
| $2.34M | ﹤0.01% |
8,200
-23,200
| -74% | -$5.69M |
|
1963
PUT
BioMarin Pharmaceuticals
BMRN
$11.5B
| $2.34M | ﹤0.01% |
42,600
-13,000
| -23% | -$766K |
|
1964
PUT
Howard Hughes
HHH
$3.93B
| $2.33M | ﹤0.01% |
34,600
+32,900
| +1,935% | +$2.25M |
|
1965
CALL
Fortuna Silver Mines
FSM
$2.59B
| $2.33M | ﹤0.01% |
356,800
-10,800
| -3% | -$66.9K |
|
|
AMTM
1966
CALL
Amentum Holdings
AMTM
$5.51B
| $2.33M | ﹤0.01% |
98,700
-32,600
| -25% | -$681K |
|
1967
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $2.32M | ﹤0.01% |
4,100
-12,400
| -75% | -$6.66M |
|
1968
CALL
Signet Jewelers
SIG
$3.55B
| $2.32M | ﹤0.01% |
29,200
-17,400
| -37% | -$1.16M |
|
1969
CALL
Alliance Resource Partners
ARLP
$3.18B
| $2.32M | ﹤0.01% |
88,700
-31,500
| -26% | -$827K |
|
1970
PUT
Star Bulk Carriers
SBLK
$3.14B
| $2.32M | ﹤0.01% |
134,300
+50,800
| +61% | +$790K |
|
|
GTM
1971
PUT
ZoomInfo Technologies
GTM
$861M
| $2.31M | ﹤0.01% |
228,700
-109,900
| -32% | -$1.02M |
|
1972
CALL
Innodata
INOD
$1.83B
| $2.3M | ﹤0.01% |
45,000
-37,100
| -45% | -$1.46M |
|
1973
CALL
MakeMyTrip
MMYT
$4.67B
| $2.3M | ﹤0.01% |
23,500
-2,200
| -9% | -$222K |
|
|
CNR
1974
CALL
Core Natural Resources Inc
CNR
$4.19B
| $2.3M | ﹤0.01% |
33,000
+11,200
| +51% | +$796K |
|
1975
PUT
Equinor
EQNR
$95.9B
| $2.3M | ﹤0.01% |
91,500
-2,500
| -3% | -$60.4K |
|
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.