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 | |
|---|---|---|---|---|---|---|
401
CALL
Estee Lauder
EL
$29.9B
| $32.3M | 0.02% |
400,100
+55,100
| +16% | +$3.54M |
|
402
PUT
Credo Technology Group
CRDO
$42.6B
| $32.1M | 0.02% |
347,000
+257,100
| +286% | +$15M |
|
403
PUT
Ford
F
$57.5B
| $32M | 0.02% |
2,948,000
-305,000
| -9% | -$3.11M |
|
404
CALL
Union Pacific
UNP
$174B
| $31.6M | 0.02% |
137,400
-37,600
| -21% | -$8.35M |
|
|
FISV
405
CALL
Fiserv Inc
FISV
$26.8B
| $31.6M | 0.02% |
183,100
+115,800
| +172% | +$21M |
|
406
PUT
SLB Ltd
SLB
$71.3B
| $30.8M | 0.02% |
911,500
-306,900
| -25% | -$10.6M |
|
407
CALL
Amgen
AMGN
$198B
| $30.7M | 0.02% |
110,000
-121,000
| -52% | -$34.3M |
|
408
PUT
Dollar General
DG
$26.5B
| $30.6M | 0.02% |
267,800
-20,600
| -7% | -$2.04M |
|
409
CALL
Upstart Holdings
UPST
$2.74B
| $30.6M | 0.02% |
472,400
-88,500
| -16% | -$4.34M |
|
410
CALL
TJX Companies
TJX
$172B
| $30.5M | 0.02% |
246,600
-13,600
| -5% | -$1.73M |
|
411
CALL
Kroger
KR
$35.3B
| $30.3M | 0.02% |
422,800
+55,300
| +15% | +$3.82M |
|
412
CALL
Unity
U
$12.8B
| $30.3M | 0.02% |
1,250,400
-84,500
| -6% | -$1.86M |
|
413
CALL
Boston Scientific
BSX
$63.9B
| $30.2M | 0.02% |
281,600
-196,400
| -41% | -$19.9M |
|
414
CALL
Coupang
CPNG
$28.1B
| $30.1M | 0.02% |
1,004,800
+42,900
| +4% | +$1.1M |
|
415
CALL
Globalstar
GSAT
$10.3B
| $30.1M | 0.02% |
1,277,500
-276,500
| -18% | -$5.57M |
|
416
CALL
Charter Communications
CHTR
$15.9B
| $30M | 0.02% |
73,300
-7,000
| -9% | -$2.68M |
|
417
PUT
United Parcel Service
UPS
$98.5B
| $29.9M | 0.02% |
296,000
-108,800
| -27% | -$10.7M |
|
418
PUT
Wayfair
W
$11.1B
| $29.8M | 0.02% |
582,600
-101,800
| -15% | -$3.8M |
|
419
PUT
Roku
ROKU
$21.2B
| $29.7M | 0.02% |
338,000
-8,100
| -2% | -$566K |
|
420
PUT
Blackrock
BLK
$164B
| $29.7M | 0.02% |
28,300
+8,700
| +44% | +$8.23M |
|
421
PUT
Digital Realty Trust
DLR
$66B
| $29.6M | 0.02% |
169,900
+31,000
| +22% | +$5.07M |
|
422
CALL
Pinterest
PINS
$12.6B
| $29.6M | 0.02% |
825,600
-503,700
| -38% | -$15.3M |
|
423
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.06B
| $29.6M | 0.02% |
264,900
-194,100
| -42% | -$5.66M |
|
424
CALL
Astera Labs
ALAB
$56.7B
| $29.4M | 0.02% |
325,500
+143,700
| +79% | +$11.4M |
|
425
PUT
Affirm
AFRM
$24.8B
| $29.4M | 0.02% |
425,100
+18,900
| +5% | +$980K |
|
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.