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 | |
|---|---|---|---|---|---|---|
|
HTO
5976
H2O America
HTO
$2.67B
| $48K | ﹤0.01% |
925
+885
| +2,213% | +$47.1K |
|
5977
CALL
Sumitomo Mitsui Financial
SMFG
$159B
| $48K | ﹤0.01% |
3,200
+300
| +10% | +$4.31K |
|
5978
CALL
Millicom
TIGO
$15.8B
| $48K | ﹤0.01% |
1,300
+1,100
| +550% | +$37.7K |
|
|
TIXT
5979
CALL
DELISTED
TELUS International
TIXT
| $48K | ﹤0.01% |
13,300
| – | – |
|
5980
PUT
UFP Technologies
UFPT
$1.97B
| $48K | ﹤0.01% |
200
-300
| -60% | -$67.5K |
|
|
BTCL
5981
PUT
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$22.2M
| $48K | ﹤0.01% |
900
+300
| +50% | +$14K |
|
5982
American Resources Corp
AREC
$183M
| $47K | ﹤0.01% |
57,029
+50,418
| +763% | +$40.4K |
|
5983
Arhaus
ARHS
$1.07B
| $47K | ﹤0.01% |
5,532
-6,128
| -53% | -$51.2K |
|
5984
PUT
AdvanSix
ASIX
$542M
| $47K | ﹤0.01% |
2,000
-1,500
| -43% | -$34K |
|
5985
Cumberland Pharmaceuticals
CPIX
$99.8M
| $47K | ﹤0.01% |
14,218
-4,882
| -26% | -$23.1K |
|
5986
CALL
Deluxe
DLX
$1.25B
| $47K | ﹤0.01% |
3,000
-4,600
| -61% | -$69.3K |
|
5987
Embecta
EMBC
$218M
| $47K | ﹤0.01% |
4,918
+2,715
| +123% | +$30.5K |
|
5988
The Honest Company
HNST
$412M
| $47K | ﹤0.01% |
9,268
-7,300
| -44% | -$35K |
|
5989
Heartland Express
HTLD
$1.01B
| $47K | ﹤0.01% |
5,529
-3,172
| -36% | -$27.2K |
|
5990
CALL
Napco Security Technologies
NSSC
$1.3B
| $47K | ﹤0.01% |
1,600
+1,500
| +1,500% | +$38.6K |
|
5991
CALL
Northwest Natural Holdings
NWN
$2.15B
| $47K | ﹤0.01% |
1,200
-1,900
| -61% | -$78.8K |
|
5992
PUT
Rocket Pharmaceuticals
RCKT
$343M
| $47K | ﹤0.01% |
19,400
+4,100
| +27% | +$20.8K |
|
5993
PUT
Sonoco
SON
$5.83B
| $47K | ﹤0.01% |
1,100
+500
| +83% | +$22.4K |
|
5994
PUT
Teleflex
TFX
$5.96B
| $47K | ﹤0.01% |
400
+200
| +100% | +$25.2K |
|
5995
Tennant Co
TNC
$1.44B
| $47K | ﹤0.01% |
614
+228
| +59% | +$16.8K |
|
5996
Direxion Daily TSLA Bear 1X ETF
TSLS
$89.5M
| $47K | ﹤0.01% |
+602
| New | +$53.6K |
|
5997
CALL
Universal Insurance Holdings
UVE
$1.26B
| $47K | ﹤0.01% |
1,700
+700
| +70% | +$17.8K |
|
5998
CALL
Full Truck Alliance
YMM
$10B
| $47K | ﹤0.01% |
4,000
-110,600
| -97% | -$1.29M |
|
5999
YPF
YPF
$19.7B
| $47K | ﹤0.01% |
1,507
-115,817
| -99% | -$3.87M |
|
|
BWIN
6000
CALL
Baldwin Insurance Group
BWIN
$2.75B
| $47K | ﹤0.01% |
1,100
-1,500
| -58% | -$60.9K |
|
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.