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 | |
|---|---|---|---|---|---|---|
326
PUT
Blackstone
BX
$150B
| $42.1M | 0.02% |
281,500
-71,000
| -20% | -$9.76M |
|
327
CALL
Celsius Holdings
CELH
$7.23B
| $42.1M | 0.02% |
907,100
-285,000
| -24% | -$11M |
|
328
PUT
Zscaler
ZS
$23B
| $42M | 0.02% |
133,800
-289,600
| -68% | -$72.2M |
|
329
CALL
Danaher
DHR
$127B
| $41.8M | 0.02% |
211,600
-94,500
| -31% | -$18.3M |
|
330
CALL
Agnico Eagle Mines
AEM
$73B
| $41.7M | 0.02% |
350,400
-50,400
| -13% | -$5.85M |
|
331
iShares Russell 2000 ETF
IWM
$81.7B
| $41.6M | 0.02% |
+192,597
| New | +$38.8M |
|
|
B
332
PUT
Barrick Mining
B
$62.4B
| $41.2M | 0.02% |
1,976,900
+446,800
| +29% | +$8.73M |
|
333
PUT
Humana
HUM
$48B
| $41.1M | 0.02% |
168,000
-12,300
| -7% | -$3.07M |
|
|
334
PUT
Celsius Holdings
CELH
$7.23B
| $40.6M | 0.02% |
876,100
-91,400
| -9% | -$3.52M |
|
|
SCHW
335
PUT
Charles Schwab
SCHW
$175B
| $40.4M | 0.02% |
541,100
+113,800
| +27% | +$9.53M |
|
336
PUT
Apollo Global Management
APO
$68.5B
| $40.1M | 0.02% |
282,400
-13,600
| -5% | -$1.8M |
|
337
CALL
Bristol-Myers Squibb
BMY
$124B
| $40M | 0.02% |
864,300
-105,900
| -11% | -$5.2M |
|
338
CALL
Marathon Digital Holdings
MARA
$4.72B
| $39.5M | 0.02% |
2,517,300
-745,500
| -23% | -$10.7M |
|
339
PUT
Nu Holdings
NU
$69.6B
| $39.4M | 0.02% |
2,874,900
+1,288,800
| +81% | +$15.4M |
|
340
PUT
General Motors
GM
$73.9B
| $39.2M | 0.02% |
797,500
-948,200
| -54% | -$44.9M |
|
341
PUT
NuScale Power
SMR
$2.96B
| $39.2M | 0.02% |
991,100
+440,200
| +80% | +$11M |
|
342
CALL
Avis
CAR
$5.82B
| $39.1M | 0.02% |
231,400
+62,600
| +37% | +$6.74M |
|
|
343
CALL
General Motors
GM
$73.9B
| $39.1M | 0.02% |
793,900
-350,600
| -31% | -$16.6M |
|
344
PUT
Workday
WDAY
$32.9B
| $39M | 0.02% |
162,600
+54,800
| +51% | +$13.3M |
|
345
PUT
ConocoPhillips
COP
$145B
| $39M | 0.02% |
434,300
+55,500
| +15% | +$4.99M |
|
346
CALL
Cloudflare
NET
$96.1B
| $38.9M | 0.02% |
198,600
-133,700
| -40% | -$19.4M |
|
347
PUT
T-Mobile US
TMUS
$206B
| $38.8M | 0.02% |
162,900
-57,700
| -26% | -$14.1M |
|
348
CALL
Riot Platforms
RIOT
$8.74B
| $38.8M | 0.02% |
3,434,500
-1,676,900
| -33% | -$14.3M |
|
349
CALL
Analog Devices
ADI
$188B
| $38.5M | 0.02% |
161,800
+50,200
| +45% | +$10.5M |
|
350
CALL
SLB Ltd
SLB
$71B
| $38.2M | 0.02% |
1,129,000
-177,900
| -14% | -$6.17M |
|
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.