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 | |
|---|---|---|---|---|---|---|
51
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.15B
| $446M | 0.23% |
6,152,700
+938,900
| +18% | +$231M |
|
52
NVIDIA
NVDA
$5T
| $401M | 0.21% |
2,149,094
-332,220
| -13% | -$57.9M |
|
53
PUT
iShares Morningstar Value ETF
ILCV
$1.31B
| $397M | 0.2% |
4,768,800
-3,031,000
| -39% | -$262M |
|
54
CALL
Applovin
APP
$140B
| $395M | 0.2% |
549,600
+58,800
| +12% | +$27.1M |
|
|
55
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.15B
| $395M | 0.2% |
5,313,500
+538,800
| +11% | +$133M |
|
56
CALL
TSMC
TSM
$2.18T
| $389M | 0.2% |
1,392,400
-150,600
| -10% | -$36.8M |
|
57
PUT
JPMorgan Chase
JPM
$919B
| $362M | 0.19% |
1,146,800
-19,500
| -2% | -$5.8M |
|
|
58
PUT
Applovin
APP
$140B
| $362M | 0.19% |
503,300
+176,100
| +54% | +$81.2M |
|
59
PUT
Coinbase
COIN
$45.2B
| $348M | 0.18% |
1,029,900
-230,100
| -18% | -$78M |
|
60
PUT
Micron Technology
MU
$1.1T
| $339M | 0.17% |
2,028,200
-825,100
| -29% | -$106M |
|
61
CALL
Boeing
BA
$162B
| $330M | 0.17% |
1,528,500
+183,900
| +14% | +$41.5M |
|
|
62
CALL
Coinbase
COIN
$45.2B
| $328M | 0.17% |
972,600
-445,600
| -31% | -$151M |
|
63
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $318M | 0.16% |
631,600
-13,200
| -2% | -$6.39M |
|
64
PUT
iShares Silver Trust
SLV
$29.1B
| $301M | 0.15% |
7,108,600
+1,605,200
| +29% | +$57.6M |
|
65
CALL
Citigroup
C
$222B
| $295M | 0.15% |
2,906,000
-375,900
| -11% | -$35.7M |
|
66
Apple
AAPL
$4.77T
| $294M | 0.15% |
1,153,494
+131,767
| +13% | +$29.8M |
|
67
PUT
ASML
ASML
$691B
| $293M | 0.15% |
302,200
+136,600
| +82% | +$107M |
|
|
68
PUT
Pinduoduo
PDD
$119B
| $282M | 0.14% |
2,134,700
+1,042,000
| +95% | +$123M |
|
69
PUT
ARK Space & Defense Innovation ETF
ARKX
$827M
| $275M | 0.14% |
3,459,200
+375,700
| +12% | +$9.86M |
|
|
CRWV
70
CALL
CoreWeave
CRWV
$45.7B
| $271M | 0.14% |
1,977,400
+1,492,400
| +308% | +$177M |
|
71
PUT
Goldman Sachs
GS
$324B
| $257M | 0.13% |
322,200
+73,700
| +30% | +$54.6M |
|
72
CALL
Costco
COST
$410B
| $254M | 0.13% |
274,700
+59,100
| +27% | +$56.6M |
|
73
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46.1B
| $251M | 0.13% |
541,000
-181,300
| -25% | -$81.7M |
|
74
PUT
Intel
INTC
$530B
| $251M | 0.13% |
7,477,800
+1,373,300
| +22% | +$33.3M |
|
|
75
PUT
Citigroup
C
$222B
| $248M | 0.13% |
2,442,800
-645,400
| -21% | -$61.2M |
|
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.