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 | |
|---|---|---|---|---|---|---|
4901
CALL
Diebold Nixdorf
DBD
$2.6B
| $138K | ﹤0.01% |
+2,500
| New | +$117K |
|
4902
PUT
iRhythm Holdings
IRTC
$4.02B
| $138K | ﹤0.01% |
900
-300
| -25% | -$38.8K |
|
|
LOMA
4903
Loma Negra
LOMA
$1.34B
| $138K | ﹤0.01% |
12,627
-7,098
| -36% | -$82.1K |
|
4904
PUT
SouthState Bank Corp
SSB
$10.3B
| $138K | ﹤0.01% |
1,500
+700
| +88% | +$61.5K |
|
4905
PUT
Washington Trust Bancorp
WASH
$748M
| $138K | ﹤0.01% |
4,900
+4,400
| +880% | +$123K |
|
4906
PUT
Zevra Therapeutics
ZVRA
$578M
| $138K | ﹤0.01% |
15,700
+1,800
| +13% | +$14.6K |
|
4907
CALL
American Homes 4 Rent
AMH
$12.1B
| $137K | ﹤0.01% |
3,800
+3,500
| +1,167% | +$130K |
|
4908
PUT
FNB Corp
FNB
$6.76B
| $137K | ﹤0.01% |
9,400
-100
| -1% | -$1.35K |
|
|
TDAY
4909
CALL
USA Today Co
TDAY
$1.29B
| $137K | ﹤0.01% |
38,400
-197,600
| -84% | -$662K |
|
4910
CALL
Personalis
PSNL
$1.25B
| $137K | ﹤0.01% |
20,900
-58,500
| -74% | -$272K |
|
4911
STMicroelectronics
STM
$43.1B
| $137K | ﹤0.01% |
4,516
-38,840
| -90% | -$964K |
|
|
TGNA
4912
CALL
DELISTED
TEGNA Inc
TGNA
| $137K | ﹤0.01% |
8,200
-10,500
| -56% | -$175K |
|
4913
CALL
Loar Holdings
LOAR
$6.23B
| $137K | ﹤0.01% |
1,600
-1,000
| -38% | -$86.5K |
|
4914
CALL
Banc of California
BANC
$2.87B
| $136K | ﹤0.01% |
9,700
-93,100
| -91% | -$1.27M |
|
|
HIVE
4915
PUT
HIVE Digital Technologies
HIVE
$679M
| $136K | ﹤0.01% |
75,700
+12,200
| +19% | +$21.5K |
|
4916
Innoviz Technologies
INVZ
$84.1M
| $136K | ﹤0.01% |
83,150
-47,731
| -36% | -$41.7K |
|
4917
CALL
Lands' End
LE
$378M
| $136K | ﹤0.01% |
+12,700
| New | +$115K |
|
4918
Leggett & Platt
LEG
$1.4B
| $136K | ﹤0.01% |
15,317
+2,427
| +19% | +$20.9K |
|
4919
PUT
Sonos
SONO
$2.09B
| $136K | ﹤0.01% |
12,600
-6,300
| -33% | -$61.3K |
|
4920
CALL
SPS Commerce
SPSC
$2.55B
| $136K | ﹤0.01% |
1,000
+400
| +67% | +$55.4K |
|
4921
Taboola.com
TBLA
$1.41B
| $136K | ﹤0.01% |
37,288
+20,697
| +125% | +$67.5K |
|
4922
CALL
Vericel Corp
VCEL
$2.38B
| $136K | ﹤0.01% |
3,200
| – | – |
|
4923
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$19.1B
| $136K | ﹤0.01% |
+2,724
| New | +$136K |
|
|
TGR
4924
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $136K | ﹤0.01% |
2,400
-3,000
| -56% | -$170K |
|
4925
CALL
First Financial Bancorp
FFBC
$3.55B
| $135K | ﹤0.01% |
5,600
+5,400
| +2,700% | +$128K |
|
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.