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 | |
|---|---|---|---|---|---|---|
6951
PUT
FTI Consulting
FCN
$5.04B
| $16K | ﹤0.01% |
100
-12,600
| -99% | -$2.06M |
|
6952
CALL
Franklin Wireless
FKWL
$27.2M
| $16K | ﹤0.01% |
4,000
+100
| +3% | +$455 |
|
6953
Franklin FTSE India ETF
FLIN
$2.75B
| $16K | ﹤0.01% |
+415
| New | +$15.9K |
|
6954
CALL
Fortive
FTV
$19.5B
| $16K | ﹤0.01% |
20,800
+18,942
| +1,019% | +$992K |
|
6955
CALL
Grid Dynamics Holdings
GDYN
$513M
| $16K | ﹤0.01% |
1,400
+200
| +17% | +$2.63K |
|
6956
PUT
GSI Technology
GSIT
$211M
| $16K | ﹤0.01% |
5,000
+1,900
| +61% | +$5.79K |
|
6957
CALL
Haleon
HLN
$45.2B
| $16K | ﹤0.01% |
1,600
-34,800
| -96% | -$367K |
|
6958
Invesco KBW Property & Casualty Insurance ETF
KBWP
$277M
| $16K | ﹤0.01% |
138
-862
| -86% | -$104K |
|
6959
Invesco KBW Premium Yield Equity REIT ETF
KBWY
$321M
| $16K | ﹤0.01% |
1,062
+676
| +175% | +$10.5K |
|
|
KWY
6960
PUT
Kingsway Corp
KWY
$265M
| $16K | ﹤0.01% |
+1,200
| New | +$12.7K |
|
|
MASI
6961
DELISTED
Masimo
MASI
| $16K | ﹤0.01% |
98
-2,240
| -96% | -$358K |
|
6962
PUT
Seres Therapeutics
MCRB
$46.5M
| $16K | ﹤0.01% |
1,500
+1,415
| +1,665% | +$12.5K |
|
|
MLGO
6963
CALL
MicroAlgo
MLGO
$45.2M
| $16K | ﹤0.01% |
+4,437
| New | +$725K |
|
6964
Meritage Homes
MTH
$4.89B
| $16K | ﹤0.01% |
+248
| New | +$16.4K |
|
6965
PUT
National Fuel Gas
NFG
$7.73B
| $16K | ﹤0.01% |
200
-2,200
| -92% | -$178K |
|
|
NLOP
6966
PUT
Net Lease Office Properties
NLOP
$179M
| $16K | ﹤0.01% |
+500
| New | +$15.3K |
|
6967
PUT
Ocugen
OCGN
$420M
| $16K | ﹤0.01% |
17,000
+10,900
| +179% | +$9.04K |
|
6968
CALL
Paymentus
PAY
$4.29B
| $16K | ﹤0.01% |
500
-1,100
| -69% | -$36.8K |
|
6969
Preferred Bank
PFBC
$1.25B
| $16K | ﹤0.01% |
+196
| New | +$16.2K |
|
6970
PUT
PJT Partners
PJT
$4.47B
| $16K | ﹤0.01% |
+100
| New | +$14.5K |
|
6971
CALL
Park Aerospace
PKE
$747M
| $16K | ﹤0.01% |
1,100
+500
| +83% | +$6.77K |
|
|
PLYM
6972
CALL
DELISTED
Plymouth Industrial REIT
PLYM
| $16K | ﹤0.01% |
1,000
+500
| +100% | +$7.81K |
|
6973
PUT
Richardson Electronics
RELL
$273M
| $16K | ﹤0.01% |
1,700
+1,200
| +240% | +$10.9K |
|
6974
PUT
SandRidge Energy
SD
$485M
| $16K | ﹤0.01% |
1,500
-10,400
| -87% | -$106K |
|
6975
Silicon Motion
SIMO
$7.51B
| $16K | ﹤0.01% |
221
-5,013
| -96% | -$285K |
|
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.