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 | |
|---|---|---|---|---|---|---|
376
CALL
Warner Bros
WBD
$64.8B
| $35M | 0.02% |
3,052,800
+574,500
| +23% | +$5.36M |
|
377
PUT
PG&E
PCG
$39.9B
| $34.8M | 0.02% |
2,493,700
+1,654,100
| +197% | +$26.9M |
|
378
CALL
Gilead Sciences
GILD
$162B
| $34.7M | 0.02% |
312,800
-161,800
| -34% | -$17.2M |
|
379
PUT
iShares Gold Trust
IAU
$64.2B
| $34.5M | 0.02% |
552,900
+78,900
| +17% | +$4.89M |
|
380
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$718M
| $34.4M | 0.02% |
575,900
+403,300
| +234% | +$18.7M |
|
381
CALL
FedEx
FDX
$76.6B
| $34.4M | 0.02% |
151,200
-26,100
| -15% | -$5.72M |
|
382
CALL
American Airlines Group
AAL
$9.78B
| $34.3M | 0.02% |
3,055,400
-1,391,700
| -31% | -$14.9M |
|
383
CALL
AT&T
T
$160B
| $34.2M | 0.02% |
1,181,500
-1,624,400
| -58% | -$44.8M |
|
384
PUT
Microchip Technology
MCHP
$46.2B
| $34.1M | 0.02% |
485,200
+80,900
| +20% | +$4.45M |
|
385
PUT
Honeywell
HON
$73.8B
| $34M | 0.02% |
155,012
-31,300
| -17% | -$6.34M |
|
386
CALL
Altria Group
MO
$121B
| $34M | 0.02% |
580,300
+28,100
| +5% | +$1.65M |
|
387
CALL
MP Materials
MP
$8.13B
| $34M | 0.02% |
1,022,100
+614,000
| +150% | +$15.7M |
|
388
PUT
Intuitive Surgical
ISRG
$121B
| $34M | 0.02% |
62,500
-30,600
| -33% | -$16M |
|
389
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $33.9M | 0.02% |
59,900
+55,800
| +1,361% | +$29.9M |
|
390
CALL
DoorDash
DASH
$77.4B
| $33.8M | 0.02% |
137,100
+14,500
| +12% | +$2.91M |
|
391
PUT
Pinterest
PINS
$12.6B
| $33.7M | 0.02% |
939,300
+309,300
| +49% | +$9.39M |
|
392
PUT
Devon Energy
DVN
$51.8B
| $33.5M | 0.02% |
1,053,900
-231,500
| -18% | -$7.37M |
|
393
PUT
TransDigm Group
TDG
$66.8B
| $33.5M | 0.02% |
22,000
+16,300
| +286% | +$22.9M |
|
|
IPFF
394
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $33.1M | 0.02% |
596,600
+360,400
| +153% | +$20M |
|
395
PUT
United States Oil Fund
USO
$2.36B
| $33.1M | 0.02% |
452,600
+172,600
| +62% | +$12.1M |
|
396
CALL
Celestica
CLS
$38.6B
| $33M | 0.02% |
211,100
-93,600
| -31% | -$9.95M |
|
397
PUT
Amgen
AMGN
$198B
| $32.9M | 0.02% |
117,900
-76,600
| -39% | -$21.7M |
|
398
CALL
On Holding
ONON
$12.2B
| $32.8M | 0.02% |
630,800
+89,000
| +16% | +$4.54M |
|
399
PUT
GameStop
GME
$9.69B
| $32.5M | 0.02% |
1,448,500
+576,100
| +66% | +$15.4M |
|
|
EXE
400
CALL
Expand Energy Corp
EXE
$22.3B
| $32.3M | 0.02% |
276,600
-38,900
| -12% | -$4.34M |
|
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.