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 | |
|---|---|---|---|---|---|---|
5901
SiTime
SITM
$15.8B
| $51K | ﹤0.01% |
+242
| New | +$43.7K |
|
5902
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $51K | ﹤0.01% |
900
-3,100
| -78% | -$156K |
|
|
SNCY
5903
DELISTED
Sun Country Airlines
SNCY
| $51K | ﹤0.01% |
+4,415
| New | +$48.5K |
|
5904
PUT
Yelp
YELP
$1.44B
| $51K | ﹤0.01% |
1,500
+1,100
| +275% | +$39.7K |
|
|
UBRL
5905
GraniteShares 2x Long UBER Daily ETF
UBRL
$18.6M
| $51K | ﹤0.01% |
+1,556
| New | +$41.9K |
|
|
PRSU
5906
PUT
Pursuit Attractions and Hospitality Inc
PRSU
$1.4B
| $51K | ﹤0.01% |
1,800
+1,100
| +157% | +$32.4K |
|
5907
CALL
Black Hills Corp
BKH
$5.5B
| $50K | ﹤0.01% |
900
-800
| -47% | -$46.8K |
|
|
CLDT
5908
Chatham Lodging
CLDT
$622M
| $50K | ﹤0.01% |
+7,297
| New | +$50.9K |
|
5909
Vita Coco
COCO
$3.82B
| $50K | ﹤0.01% |
1,405
-4,475
| -76% | -$149K |
|
|
5910
PUT
Vita Coco
COCO
$3.82B
| $50K | ﹤0.01% |
1,400
-4,100
| -75% | -$137K |
|
5911
Collegium Pharmaceutical
COLL
$1.17B
| $50K | ﹤0.01% |
1,715
+56
| +3% | +$1.6K |
|
5912
PUT
Coty
COTY
$2.37B
| $50K | ﹤0.01% |
10,800
-15,500
| -59% | -$76.7K |
|
5913
HF Sinclair
DINO
$16.7B
| $50K | ﹤0.01% |
1,236
-28,800
| -96% | -$992K |
|
5914
DXC Technology
DXC
$1.82B
| $50K | ﹤0.01% |
3,299
-51,613
| -94% | -$794K |
|
|
GRFS
5915
CALL
Grifois
GRFS
$5.58B
| $50K | ﹤0.01% |
5,600
-5,200
| -48% | -$40.6K |
|
5916
PUT
Harmony Biosciences
HRMY
$2.08B
| $50K | ﹤0.01% |
1,600
+800
| +100% | +$25.7K |
|
5917
CALL
Kaspi.kz JSC
KSPI
$16.9B
| $50K | ﹤0.01% |
600
-21,400
| -97% | -$1.83M |
|
|
MASI
5918
PUT
DELISTED
Masimo
MASI
| $50K | ﹤0.01% |
300
-7,300
| -96% | -$1.17M |
|
5919
CALL
Nomad Foods
NOMD
$1.73B
| $50K | ﹤0.01% |
3,000
-3,400
| -53% | -$62.4K |
|
|
OCFT
5920
DELISTED
OneConnect Financial Technology
OCFT
| $50K | ﹤0.01% |
7,024
+3,712
| +112% | +$24.7K |
|
5921
Peoples Bancorp
PEBO
$1.49B
| $50K | ﹤0.01% |
1,647
-193
| -10% | -$5.64K |
|
5922
PUT
Arcus Biosciences
RCUS
$3.55B
| $50K | ﹤0.01% |
6,200
+2,000
| +48% | +$17.1K |
|
5923
CALL
Veralto
VLTO
$23.1B
| $50K | ﹤0.01% |
500
-200
| -29% | -$19.3K |
|
5924
CALL
York Water
YORW
$501M
| $50K | ﹤0.01% |
1,600
+1,200
| +300% | +$40.1K |
|
5925
BrightSpring Health Services
BTSG
$14.3B
| $50K | ﹤0.01% |
2,139
-6,369
| -75% | -$133K |
|
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.