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 | |
|---|---|---|---|---|---|---|
6801
PUT
Dine Brands
DIN
$458M
| $19K | ﹤0.01% |
800
-38,700
| -98% | -$894K |
|
6802
CALL
Eastern Bankshares
EBC
$5.39B
| $19K | ﹤0.01% |
1,300
-36,300
| -97% | -$545K |
|
|
DMC
6803
PUT
Del Monte Corp
DMC
$1.37B
| $19K | ﹤0.01% |
600
-4,500
| -88% | -$148K |
|
|
HTBK
6804
CALL
DELISTED
Heritage Commerce
HTBK
| $19K | ﹤0.01% |
+2,000
| New | +$18.3K |
|
6805
PUT
Janus Henderson Small Cap Growth Alpha ETF
JSML
$362M
| $19K | ﹤0.01% |
+400
| New | +$25K |
|
6806
PUT
Kontoor Brands
KTB
$4.87B
| $19K | ﹤0.01% |
300
+200
| +200% | +$12.9K |
|
6807
CALL
MediWound
MDWD
$188M
| $19K | ﹤0.01% |
1,000
+600
| +150% | +$11.3K |
|
|
6808
MediWound
MDWD
$188M
| $19K | ﹤0.01% |
984
+52
| +6% | +$980 |
|
6809
MeiraGTx Holdings
MGTX
$1.09B
| $19K | ﹤0.01% |
3,005
-1,026
| -25% | -$6.06K |
|
|
MITT
6810
CALL
TPG Mortgage Investment Trust
MITT
$230M
| $19K | ﹤0.01% |
2,600
-700
| -21% | -$4.84K |
|
|
MTA
6811
PUT
Metalla Royalty & Streaming
MTA
$688M
| $19K | ﹤0.01% |
5,000
-500
| -9% | -$1.59K |
|
6812
CALL
NETSCOUT
NTCT
$2.89B
| $19K | ﹤0.01% |
+800
| New | +$17.8K |
|
|
PCH
6813
CALL
DELISTED
PotlatchDeltic
PCH
| $19K | ﹤0.01% |
500
+400
| +400% | +$15.7K |
|
|
RPC
6814
CALL
Ridgepost Capital
RPC
$971M
| $19K | ﹤0.01% |
1,900
-600
| -24% | -$6.43K |
|
6815
CALL
RPC Inc
RES
$1.14B
| $19K | ﹤0.01% |
4,100
-25,700
| -86% | -$124K |
|
|
SEMR
6816
CALL
DELISTED
Semrush
SEMR
| $19K | ﹤0.01% |
2,200
-23,100
| -91% | -$224K |
|
6817
Senseonics Holdings Inc
SENS
$256M
| $19K | ﹤0.01% |
2,064
-3,050
| -60% | -$35.6K |
|
6818
PUT
Sun Life Financial
SLF
$46.6B
| $19K | ﹤0.01% |
300
+200
| +200% | +$12.3K |
|
6819
PUT
Telecom Argentina
TEO
$5.86B
| $19K | ﹤0.01% |
2,200
-400
| -15% | -$4K |
|
|
TPH
6820
PUT
DELISTED
Tri Pointe Homes
TPH
| $19K | ﹤0.01% |
600
-12,300
| -95% | -$377K |
|
6821
PUT
UFP Industries
UFPI
$5.14B
| $19K | ﹤0.01% |
200
| – | – |
|
|
UMH
6822
UMH Properties
UMH
$1.34B
| $19K | ﹤0.01% |
1,170
+944
| +418% | +$16.2K |
|
6823
CALL
Westamerica Bancorp
WABC
$1.39B
| $19K | ﹤0.01% |
400
+100
| +33% | +$4.79K |
|
6824
CALL
Zumiez
ZUMZ
$347M
| $19K | ﹤0.01% |
1,500
-1,700
| -53% | -$21.5K |
|
|
LIF
6825
CALL
Life360
LIF
$4.59B
| $19K | ﹤0.01% |
+300
| New | +$15.4K |
|
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.