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 | |
|---|---|---|---|---|---|---|
726
PUT
Advance Auto Parts
AAP
$3.35B
| $13M | 0.01% |
279,700
+70,700
| +34% | +$2.83M |
|
727
ProShares Short QQQ
PSQ
$673M
| $13M | 0.01% |
385,908
-109,412
| -22% | -$4.14M |
|
728
PUT
Synopsys
SNPS
$72.3B
| $13M | 0.01% |
25,300
+13,400
| +113% | +$6.24M |
|
729
CALL
Pan American Silver
PAAS
$19.1B
| $13M | 0.01% |
456,500
+232,200
| +104% | +$6.01M |
|
730
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$22B
| $13M | 0.01% |
515,960
-366,764
| -42% | -$5.9M |
|
731
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $13M | 0.01% |
29,100
+7,300
| +33% | +$3.36M |
|
732
PUT
GSK
GSK
$102B
| $12.9M | 0.01% |
337,000
+97,200
| +41% | +$3.71M |
|
|
GAP
733
PUT
The Gap Inc
GAP
$7.07B
| $12.9M | 0.01% |
592,300
+212,900
| +56% | +$4.76M |
|
734
CALL
Elevance Health
ELV
$84.4B
| $12.9M | 0.01% |
33,200
-5,600
| -14% | -$2.25M |
|
735
PUT
Novartis
NVS
$291B
| $12.9M | 0.01% |
106,800
+51,000
| +91% | +$5.75M |
|
736
PUT
Wingstop
WING
$3.76B
| $12.9M | 0.01% |
38,300
-9,300
| -20% | -$2.75M |
|
737
PUT
Kinder Morgan
KMI
$72.3B
| $12.9M | 0.01% |
438,400
-58,800
| -12% | -$1.61M |
|
738
CALL
The Mosaic Company
MOS
$7.24B
| $12.9M | 0.01% |
352,900
+81,300
| +30% | +$2.6M |
|
739
PUT
Tyson Foods
TSN
$20.1B
| $12.8M | 0.01% |
229,100
+83,900
| +58% | +$4.82M |
|
740
CALL
Lennar Class A
LEN
$19.8B
| $12.8M | 0.01% |
191,900
-268,400
| -58% | -$29.1M |
|
|
EXE
741
PUT
Expand Energy Corp
EXE
$22.3B
| $12.8M | 0.01% |
109,300
+18,900
| +21% | +$2.11M |
|
742
CALL
Schwab US Broad Market ETF
SCHB
$43.3B
| $12.8M | 0.01% |
486,400
-108,400
| -18% | -$2.39M |
|
743
Boston Scientific
BSX
$63.9B
| $12.7M | 0.01% |
118,658
+36,984
| +45% | +$3.74M |
|
|
DOCU
744
PUT
DocuSign
DOCU
$9.14B
| $12.7M | 0.01% |
163,400
+40,700
| +33% | +$3.29M |
|
745
CALL
Hershey
HSY
$35B
| $12.7M | 0.01% |
76,600
-72,800
| -49% | -$12M |
|
|
HUT
746
CALL
Hut 8
HUT
$12.4B
| $12.7M | 0.01% |
683,400
+261,500
| +62% | +$3.9M |
|
747
CALL
Wayfair
W
$11.1B
| $12.7M | 0.01% |
247,900
-142,500
| -37% | -$5.32M |
|
748
CALL
Bilibili
BILI
$7.4B
| $12.7M | 0.01% |
590,900
-495,300
| -46% | -$9.12M |
|
749
Coinbase
COIN
$43.8B
| $12.7M | 0.01% |
36,126
-51,432
| -59% | -$12M |
|
750
CALL
Emerson Electric
EMR
$78.2B
| $12.7M | 0.01% |
94,900
-125,600
| -57% | -$14.4M |
|
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.