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 | |
|---|---|---|---|---|---|---|
|
SGMO
4801
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $150K | ﹤0.01% |
278,800
-247,500
| -47% | -$147K |
|
4802
CALL
Seanergy Maritime Holdings
SHIP
$349M
| $150K | ﹤0.01% |
23,900
+1,100
| +5% | +$6.62K |
|
4803
PUT
Amprius Technologies
AMPX
$1.2B
| $149K | ﹤0.01% |
35,400
-9,200
| -21% | -$25.9K |
|
4804
PUT
Cognex
CGNX
$9.62B
| $149K | ﹤0.01% |
4,700
-5,700
| -55% | -$163K |
|
|
COOP
4805
CALL
DELISTED
Mr. Cooper
COOP
| $149K | ﹤0.01% |
1,000
-36,100
| -97% | -$4.63M |
|
4806
CALL
DXP Enterprises
DXPE
$2.3B
| $149K | ﹤0.01% |
1,700
+100
| +6% | +$8.33K |
|
4807
PUT
Gladstone Investment Corp
GAIN
$642M
| $149K | ﹤0.01% |
10,500
-1,500
| -13% | -$20.9K |
|
4808
CALL
LGI Homes
LGIH
$1.35B
| $149K | ﹤0.01% |
2,900
-11,400
| -80% | -$624K |
|
4809
PSQ Holdings
PSQH
$12.4M
| $149K | ﹤0.01% |
4,850
+3,799
| +361% | +$116K |
|
4810
QuinStreet
QNST
$927M
| $149K | ﹤0.01% |
9,262
+813
| +10% | +$13K |
|
4811
CALL
Repligen
RGEN
$6.91B
| $149K | ﹤0.01% |
1,200
-2,900
| -71% | -$369K |
|
4812
PUT
SiTime
SITM
$13.8B
| $149K | ﹤0.01% |
700
-2,700
| -79% | -$488K |
|
|
CGAU
4813
CALL
Centerra Gold
CGAU
$3.33B
| $148K | ﹤0.01% |
20,600
+13,200
| +178% | +$90.3K |
|
4814
Invesco CurrencyShares Swiss Franc Trust
FXF
$411M
| $148K | ﹤0.01% |
+1,328
| New | +$143K |
|
4815
CALL
Monte Rosa Therapeutics
GLUE
$1.82B
| $148K | ﹤0.01% |
33,000
+23,100
| +233% | +$103K |
|
|
PPIH
4816
CALL
Perma-Pipe International
PPIH
$189M
| $148K | ﹤0.01% |
+6,500
| New | +$93.7K |
|
4817
CALL
RB Global
RBA
$21.5B
| $148K | ﹤0.01% |
1,400
-23,000
| -94% | -$2.36M |
|
4818
CALL
TriMas Corp
TRS
$1.41B
| $148K | ﹤0.01% |
+5,200
| New | +$128K |
|
|
CTEV
4819
PUT
Claritev Corp
CTEV
$399M
| $148K | ﹤0.01% |
3,300
-300
| -8% | -$8.63K |
|
4820
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$47.1B
| $147K | ﹤0.01% |
1,608
-2,380
| -60% | -$218K |
|
4821
Cullinan Oncology
CGEM
$1.06B
| $147K | ﹤0.01% |
19,557
+15,959
| +444% | +$128K |
|
|
CLPR
4822
PUT
Clipper Realty
CLPR
$46.4M
| $147K | ﹤0.01% |
40,100
-22,900
| -36% | -$87.5K |
|
4823
Evergy
EVRG
$19.4B
| $147K | ﹤0.01% |
+2,140
| New | +$144K |
|
4824
PUT
Extra Space Storage
EXR
$32.3B
| $147K | ﹤0.01% |
1,000
-2,100
| -68% | -$306K |
|
4825
CALL
Five Point Holdings
FPH
$387M
| $147K | ﹤0.01% |
26,900
-6,400
| -19% | -$34.3K |
|
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.