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 | |
|---|---|---|---|---|---|---|
1426
CALL
Invitation Homes
INVH
$17.7B
| $4.56M | ﹤0.01% |
139,000
+19,500
| +16% | +$655K |
|
1427
PUT
T. Rowe Price
TROW
$25B
| $4.54M | ﹤0.01% |
47,100
-1,400
| -3% | -$129K |
|
1428
CleanSpark
CLSK
$3.73B
| $4.54M | ﹤0.01% |
411,956
-117,687
| -22% | -$1.05M |
|
|
SKX
1429
CALL
DELISTED
Skechers
SKX
| $4.54M | ﹤0.01% |
72,000
+38,900
| +118% | +$2.23M |
|
1430
PUT
Viking Therapeutics
VKTX
$4.04B
| $4.53M | ﹤0.01% |
171,100
+11,000
| +7% | +$290K |
|
|
BNY
1431
PUT
Bank of New York Mellon
BNY
$108B
| $4.52M | ﹤0.01% |
49,600
-12,100
| -20% | -$1.03M |
|
|
HSAI
1432
CALL
Hesai Group
HSAI
$2.29B
| $4.52M | ﹤0.01% |
205,900
+111,900
| +119% | +$1.97M |
|
1433
Oscar Health
OSCR
$8.5B
| $4.52M | ﹤0.01% |
+210,776
| New | +$3.13M |
|
1434
CALL
Plug Power
PLUG
$2.93B
| $4.51M | ﹤0.01% |
3,030,200
+739,400
| +32% | +$738K |
|
1435
CALL
Guardant Health
GH
$19.5B
| $4.51M | ﹤0.01% |
86,700
-25,100
| -22% | -$1.12M |
|
1436
CALL
West Pharmaceutical
WST
$23.1B
| $4.51M | ﹤0.01% |
20,600
+3,800
| +23% | +$812K |
|
1437
PUT
Quanta Services
PWR
$93.9B
| $4.5M | ﹤0.01% |
11,900
+3,100
| +35% | +$995K |
|
1438
CALL
HSBC
HSBC
$355B
| $4.5M | ﹤0.01% |
74,000
+19,800
| +37% | +$1.13M |
|
1439
CALL
KULR Technology Group
KULR
$117M
| $4.5M | ﹤0.01% |
630,800
+542,225
| +612% | +$5.14M |
|
|
TSSI
1440
CALL
TSS Inc
TSSI
$272M
| $4.49M | ﹤0.01% |
155,800
+65,100
| +72% | +$856K |
|
1441
PUT
NextNav
NN
$1.7B
| $4.48M | ﹤0.01% |
294,500
+238,000
| +421% | +$3.05M |
|
1442
CALL
DaVita
DVA
$15.1B
| $4.47M | ﹤0.01% |
31,400
+14,600
| +87% | +$2.07M |
|
|
XIFR
1443
CALL
XPLR Infrastructure LP
XIFR
$1.18B
| $4.47M | ﹤0.01% |
545,200
+201,100
| +58% | +$1.75M |
|
1444
CALL
Alnylam Pharmaceuticals
ALNY
$36.3B
| $4.47M | ﹤0.01% |
13,700
-18,000
| -57% | -$4.98M |
|
1445
CALL
FuboTV Inc
FUBO
$245M
| $4.46M | ﹤0.01% |
96,383
+10,675
| +12% | +$399K |
|
1446
CALL
Madrigal Pharmaceuticals
MDGL
$12.6B
| $4.45M | ﹤0.01% |
14,700
-900
| -6% | -$268K |
|
|
BPMC
1447
PUT
DELISTED
Blueprint Medicines
BPMC
| $4.45M | ﹤0.01% |
34,700
+27,900
| +410% | +$2.9M |
|
|
OS
1448
CALL
DELISTED
OneStream Inc
OS
| $4.45M | ﹤0.01% |
157,100
+149,000
| +1,840% | +$3.71M |
|
1449
PUT
Alpha Metallurgical Resources
AMR
$1.82B
| $4.43M | ﹤0.01% |
39,400
-1,700
| -4% | -$199K |
|
1450
Teladoc Health
TDOC
$1.58B
| $4.42M | ﹤0.01% |
507,190
+292,251
| +136% | +$2.12M |
|
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.