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 | |
|---|---|---|---|---|---|---|
3851
PUT
Rush Street Interactive
RSI
$3.16B
| $365K | ﹤0.01% |
24,500
-40,600
| -62% | -$504K |
|
3852
HealthEquity
HQY
$8.46B
| $363K | ﹤0.01% |
3,466
-2,051
| -37% | -$194K |
|
3853
Douglas Emmett
DEI
$2.01B
| $362K | ﹤0.01% |
24,104
+9,252
| +62% | +$134K |
|
3854
CALL
SiTime
SITM
$14.7B
| $362K | ﹤0.01% |
1,700
-7,100
| -81% | -$1.28M |
|
3855
PUT
Telephone and Data Systems
TDS
$3.87B
| $362K | ﹤0.01% |
10,200
-34,100
| -77% | -$1.2M |
|
3856
Sprott Uranium Miners ETF
URNM
$1.75B
| $362K | ﹤0.01% |
7,555
-24,078
| -76% | -$913K |
|
3857
CALL
Hilton Grand Vacations
HGV
$4.14B
| $361K | ﹤0.01% |
8,700
-3,300
| -28% | -$125K |
|
3858
Immersion
IMMR
$254M
| $361K | ﹤0.01% |
45,881
-27,419
| -37% | -$204K |
|
3859
PUT
Lightspeed Commerce
LSPD
$1.41B
| $360K | ﹤0.01% |
30,800
-16,600
| -35% | -$171K |
|
3860
PUT
Concentrix
CNXC
$1.55B
| $359K | ﹤0.01% |
6,800
-26,200
| -79% | -$1.38M |
|
|
SII
3861
PUT
Sprott
SII
$2.73B
| $359K | ﹤0.01% |
5,200
+1,800
| +53% | +$100K |
|
3862
PUT
Eastman Chemical
EMN
$7.79B
| $358K | ﹤0.01% |
4,800
+2,600
| +118% | +$204K |
|
3863
PUT
Genesis Energy
GEL
$1.81B
| $358K | ﹤0.01% |
20,800
-89,900
| -81% | -$1.36M |
|
3864
CALL
Haemonetics
HAE
$3.75B
| $358K | ﹤0.01% |
4,800
-7,600
| -61% | -$503K |
|
3865
Melco Resorts & Entertainment
MLCO
$2.19B
| $358K | ﹤0.01% |
49,623
-23,726
| -32% | -$138K |
|
3866
Replimune Group
REPL
$449M
| $358K | ﹤0.01% |
38,546
+32,900
| +583% | +$287K |
|
|
HTGCR
3867
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $358K | ﹤0.01% |
19,600
-20,000
| -51% | -$365K |
|
3868
CALL
BeyondSpring
BYSI
$48.9M
| $357K | ﹤0.01% |
+152,000
| New | +$281K |
|
3869
PUT
Factset
FDS
$10.1B
| $357K | ﹤0.01% |
+800
| New | +$350K |
|
3870
PUT
FIVE9
FIVN
$2.08B
| $357K | ﹤0.01% |
13,500
-80,900
| -86% | -$2.11M |
|
3871
Healthcare Realty
HR
$7.58B
| $357K | ﹤0.01% |
+22,560
| New | +$343K |
|
3872
Xeris Biopharma Holdings
XERS
$1.42B
| $357K | ﹤0.01% |
+76,644
| New | +$351K |
|
3873
PUT
Credit Acceptance
CACC
$5.84B
| $356K | ﹤0.01% |
700
+500
| +250% | +$246K |
|
3874
China Yuchai International
CYD
$1.74B
| $356K | ﹤0.01% |
14,912
-1,049
| -7% | -$18.4K |
|
|
MESO
3875
CALL
Mesoblast
MESO
$1.87B
| $356K | ﹤0.01% |
32,700
+5,800
| +22% | +$65K |
|
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.