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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
651
CALL
StoneCo
STNE
$2.67B
| $19.3M | 0.01% |
1,019,800
+208,800
| +26% | +$3.32M |
|
652
PUT
Constellation Brands
STZ
$22.1B
| $19.3M | 0.01% |
143,000
+76,000
| +113% | +$12.1M |
|
|
GLXY
653
PUT
Galaxy Digital Inc
GLXY
$4.66B
| $19.2M | 0.01% |
+568,700
| New | +$15.3M |
|
654
CALL
NRG Energy
NRG
$30.2B
| $19.2M | 0.01% |
118,500
-27,900
| -19% | -$4.35M |
|
655
CALL
Tapestry
TPR
$28.1B
| $19.1M | 0.01% |
169,100
-79,200
| -32% | -$8.29M |
|
656
CALL
The GEO Group
GEO
$4.15B
| $19.1M | 0.01% |
931,200
+191,900
| +26% | +$4.38M |
|
657
CALL
Deere & Co
DE
$165B
| $19.1M | 0.01% |
41,700
-9,700
| -19% | -$4.78M |
|
658
PUT
General Mills
GIS
$19B
| $19.1M | 0.01% |
378,100
+81,500
| +27% | +$4.09M |
|
659
CALL
Wayfair
W
$10.9B
| $19.1M | 0.01% |
213,400
-34,500
| -14% | -$2.53M |
|
660
CALL
Chewy
CHWY
$8.38B
| $19M | 0.01% |
469,400
-146,300
| -24% | -$5.64M |
|
|
BLSH
661
PUT
Bullish
BLSH
$3.68B
| $19M | 0.01% |
+298,500
| New | +$18.3M |
|
662
PUT
Centrus Energy
LEU
$3.36B
| $18.9M | 0.01% |
61,100
+4,500
| +8% | +$995K |
|
|
OKLO
663
Oklo
OKLO
$7.66B
| $18.9M | 0.01% |
+169,596
| New | +$13.3M |
|
664
CALL
e.l.f. Beauty
ELF
$4.49B
| $18.9M | 0.01% |
142,600
-27,800
| -16% | -$3.43M |
|
665
PUT
Marriott International
MAR
$96.1B
| $18.9M | 0.01% |
72,400
-29,600
| -29% | -$7.95M |
|
666
PUT
Pan American Silver
PAAS
$18.6B
| $18.8M | 0.01% |
485,700
+182,200
| +60% | +$5.86M |
|
667
PUT
Honeywell
HON
$78B
| $18.8M | 0.01% |
94,535
-60,477
| -39% | -$12.6M |
|
|
ETHE
668
CALL
Grayscale Ethereum Staking ETF Shares
ETHE
$1.52B
| $18.7M | 0.01% |
545,800
+271,600
| +99% | +$8.79M |
|
669
PUT
TJX Companies
TJX
$170B
| $18.7M | 0.01% |
129,400
-72,300
| -36% | -$9.61M |
|
670
PUT
British American Tobacco
BTI
$129B
| $18.7M | 0.01% |
352,200
+18,000
| +5% | +$977K |
|
671
CALL
Ulta Beauty
ULTA
$20.5B
| $18.6M | 0.01% |
34,000
-7,500
| -18% | -$3.84M |
|
672
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$163M
| $18.6M | 0.01% |
559,900
+333,700
| +148% | +$13.2M |
|
673
CALL
CME Group
CME
$91.9B
| $18.6M | 0.01% |
68,700
-3,900
| -5% | -$1.06M |
|
|
GLXY
674
CALL
Galaxy Digital Inc
GLXY
$4.66B
| $18.6M | 0.01% |
+548,800
| New | +$14.8M |
|
675
PUT
Energy Fuels
UUUU
$3B
| $18.6M | 0.01% |
1,208,600
+408,800
| +51% | +$4.34M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.