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 | |
|---|---|---|---|---|---|---|
626
CALL
Kinder Morgan
KMI
$72.3B
| $16.5M | 0.01% |
562,300
-702,800
| -56% | -$19.3M |
|
627
CALL
Workday
WDAY
$32.7B
| $16.4M | 0.01% |
68,500
-16,400
| -19% | -$3.99M |
|
628
PUT
Alcoa
AA
$12.2B
| $16.4M | 0.01% |
556,600
+58,300
| +12% | +$1.57M |
|
629
CALL
CF Industries
CF
$19.6B
| $16.4M | 0.01% |
177,900
+39,500
| +29% | +$3.36M |
|
630
PUT
AngloGold Ashanti
AU
$41B
| $16.4M | 0.01% |
359,100
+205,800
| +134% | +$8.86M |
|
631
PUT
eBay
EBAY
$49.3B
| $16.2M | 0.01% |
217,500
-78,000
| -26% | -$5.53M |
|
632
PUT
Linde
LIN
$235B
| $16.2M | 0.01% |
34,500
+1,600
| +5% | +$730K |
|
633
CALL
Planet Fitness
PLNT
$4.28B
| $16.1M | 0.01% |
148,100
+19,400
| +15% | +$1.94M |
|
634
CALL
Nutanix
NTNX
$14.4B
| $16.1M | 0.01% |
211,200
-61,700
| -23% | -$4.44M |
|
635
CALL
Williams Companies
WMB
$91.1B
| $16.1M | 0.01% |
256,800
-270,700
| -51% | -$16M |
|
636
PUT
Valero Energy
VLO
$92.3B
| $16.1M | 0.01% |
119,800
-25,700
| -18% | -$3.2M |
|
637
PUT
Bloom Energy
BE
$62.1B
| $16.1M | 0.01% |
671,200
+34,000
| +5% | +$658K |
|
|
ZVOL
638
PUT
Volatility Premium Plus ETF
ZVOL
$13.1M
| $16M | 0.01% |
295,000
-288,500
| -49% | -$3.83M |
|
639
CALL
Ross Stores
ROST
$76.4B
| $16M | 0.01% |
125,500
-18,500
| -13% | -$2.57M |
|
640
CALL
D.R. Horton
DHI
$40B
| $16M | 0.01% |
123,900
-56,300
| -31% | -$6.93M |
|
641
PUT
Best Buy
BBY
$18.4B
| $15.9M | 0.01% |
237,000
+29,400
| +14% | +$2M |
|
642
CALL
Fair Isaac
FICO
$28.3B
| $15.9M | 0.01% |
8,700
+1,200
| +16% | +$2.25M |
|
|
643
PUT
Fair Isaac
FICO
$28.3B
| $15.9M | 0.01% |
8,700
+6,900
| +383% | +$13M |
|
644
CALL
Quantum Computing Inc
QUBT
$1.78B
| $15.9M | 0.01% |
827,100
+445,600
| +117% | +$4.91M |
|
645
PUT
British American Tobacco
BTI
$134B
| $15.8M | 0.01% |
334,200
-89,000
| -21% | -$3.94M |
|
646
PUT
CME Group
CME
$90.1B
| $15.7M | 0.01% |
57,000
+41,400
| +265% | +$11.3M |
|
647
CALL
Nucor
NUE
$53.7B
| $15.6M | 0.01% |
120,700
-125,800
| -51% | -$14.7M |
|
648
CALL
Suncor Energy
SU
$76.4B
| $15.6M | 0.01% |
452,900
+23,000
| +5% | +$832K |
|
649
CALL
Coherent
COHR
$61.1B
| $15.6M | 0.01% |
175,100
-143,300
| -45% | -$10.3M |
|
650
PUT
Burlington
BURL
$22.3B
| $15.6M | 0.01% |
67,100
+51,500
| +330% | +$12.2M |
|
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.