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 | |
|---|---|---|---|---|---|---|
1076
CALL
Harley-Davidson
HOG
$2.79B
| $8.45M | ﹤0.01% |
302,700
+97,400
| +47% | +$2.61M |
|
1077
CALL
Progressive
PGR
$120B
| $8.45M | ﹤0.01% |
34,200
-5,300
| -13% | -$1.31M |
|
1078
PUT
Darden Restaurants
DRI
$22.2B
| $8.43M | ﹤0.01% |
44,300
-8,200
| -16% | -$1.69M |
|
1079
PUT
Brighthouse Financial
BHF
$3.6B
| $8.41M | ﹤0.01% |
158,500
+146,500
| +1,221% | +$7.15M |
|
1080
CALL
KB Home
KBH
$3.41B
| $8.38M | ﹤0.01% |
131,700
-24,600
| -16% | -$1.49M |
|
1081
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.14B
| $8.33M | ﹤0.01% |
119,400
+113,000
| +1,766% | +$7.45M |
|
1082
CALL
Sibanye-Stillwater
SBSW
$5.97B
| $8.33M | ﹤0.01% |
741,200
-111,600
| -13% | -$975K |
|
1083
PUT
C3.ai
AI
$1.27B
| $8.32M | ﹤0.01% |
480,100
+65,700
| +16% | +$1.37M |
|
1084
PUT
Cintas
CTAS
$81.3B
| $8.31M | ﹤0.01% |
40,500
+21,100
| +109% | +$4.51M |
|
1085
CALL
Toll Brothers
TOL
$13.7B
| $8.3M | ﹤0.01% |
60,100
+12,900
| +27% | +$1.68M |
|
1086
PUT
Carrier Global
CARR
$57.4B
| $8.3M | ﹤0.01% |
139,000
+99,100
| +248% | +$6.73M |
|
1087
CALL
AngloGold Ashanti
AU
$39.7B
| $8.28M | ﹤0.01% |
133,700
-64,500
| -33% | -$3.61M |
|
1088
CALL
ON Semiconductor
ON
$35.1B
| $8.27M | ﹤0.01% |
167,700
-186,900
| -53% | -$9.84M |
|
|
KEEL
1089
PUT
Keel Infrastructure Corp
KEEL
$2.9B
| $8.26M | ﹤0.01% |
2,936,600
+2,314,900
| +372% | +$3.59M |
|
1090
ProShares Ultra Silver
AGQ
$1.14B
| $8.26M | ﹤0.01% |
108,381
+65,986
| +156% | +$3.72M |
|
1091
CALL
Bitwise Bitcoin ETF
BITB
$2.49B
| $8.26M | ﹤0.01% |
132,700
+98,000
| +282% | +$6.1M |
|
1092
Snap
SNAP
$7.42B
| $8.25M | ﹤0.01% |
1,070,510
+287,673
| +37% | +$2.39M |
|
1093
PUT
VF Corp
VFC
$6.49B
| $8.24M | ﹤0.01% |
571,100
-155,600
| -21% | -$2.09M |
|
1094
NIO
NIO
$11.6B
| $8.23M | ﹤0.01% |
1,080,624
+494,379
| +84% | +$2.66M |
|
1095
PUT
Ross Stores
ROST
$74.5B
| $8.23M | ﹤0.01% |
54,000
+32,700
| +154% | +$4.67M |
|
1096
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $8.22M | ﹤0.01% |
21,000
-8,100
| -28% | -$3.39M |
|
1097
Dow Inc
DOW
$22.3B
| $8.22M | ﹤0.01% |
360,761
+339,312
| +1,582% | +$8.45M |
|
1098
PUT
LyondellBasell Industries
LYB
$19.9B
| $8.21M | ﹤0.01% |
167,500
-14,800
| -8% | -$835K |
|
1099
CALL
Deutsche Bank
DB
$65.3B
| $8.19M | ﹤0.01% |
231,400
+115,000
| +99% | +$3.92M |
|
1100
PUT
Monolithic Power Systems
MPWR
$68.6B
| $8.19M | ﹤0.01% |
8,900
+3,300
| +59% | +$2.68M |
|
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.