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 | |
|---|---|---|---|---|---|---|
|
VNET
1226
CALL
VNET Group
VNET
$2.1B
| $6.67M | ﹤0.01% |
645,400
+470,000
| +268% | +$3.96M |
|
1227
PUT
Kroger
KR
$34.7B
| $6.66M | ﹤0.01% |
269,100
+116,700
| +77% | +$8.13M |
|
1228
PUT
Toronto Dominion Bank
TD
$197B
| $6.65M | ﹤0.01% |
83,200
+34,900
| +72% | +$2.62M |
|
1229
CALL
Stellantis
STLA
$16.5B
| $6.61M | ﹤0.01% |
707,400
-53,400
| -7% | -$511K |
|
1230
PUT
FuboTV Inc
FUBO
$251M
| $6.6M | ﹤0.01% |
132,492
+9,825
| +8% | +$446K |
|
1231
Oracle
ORCL
$336B
| $6.6M | ﹤0.01% |
23,459
-64,615
| -73% | -$16.5M |
|
1232
DoorDash
DASH
$75.1B
| $6.59M | ﹤0.01% |
24,228
+16,651
| +220% | +$4.18M |
|
1233
CALL
Hilton Worldwide
HLT
$74.2B
| $6.59M | ﹤0.01% |
25,400
-3,600
| -12% | -$973K |
|
1234
PUT
MGM Resorts International
MGM
$11.7B
| $6.57M | ﹤0.01% |
189,600
-74,800
| -28% | -$2.74M |
|
1235
CALL
Bunge Global
BG
$23.7B
| $6.57M | ﹤0.01% |
80,800
+23,800
| +42% | +$1.91M |
|
1236
CALL
NetApp
NTAP
$32.8B
| $6.56M | ﹤0.01% |
55,400
-32,300
| -37% | -$3.61M |
|
1237
PUT
PENN Entertainment
PENN
$2.77B
| $6.56M | ﹤0.01% |
340,600
-317,600
| -48% | -$5.96M |
|
1238
PUT
Cytokinetics
CYTK
$11B
| $6.56M | ﹤0.01% |
119,300
+92,500
| +345% | +$3.81M |
|
1239
Ionis Pharmaceuticals
IONS
$9.36B
| $6.55M | ﹤0.01% |
100,206
+60,568
| +153% | +$2.96M |
|
1240
PUT
Align Technology
ALGN
$12.1B
| $6.55M | ﹤0.01% |
52,300
+5,400
| +12% | +$846K |
|
1241
PUT
Northrop Grumman
NOC
$76.7B
| $6.52M | ﹤0.01% |
10,700
-5,200
| -33% | -$2.95M |
|
1242
PUT
Nice
NICE
$5.32B
| $6.51M | ﹤0.01% |
45,000
+32,300
| +254% | +$4.85M |
|
1243
CALL
monday.com
MNDY
$3.25B
| $6.51M | ﹤0.01% |
33,600
+25,400
| +310% | +$5.85M |
|
1244
CALL
Abercrombie & Fitch
ANF
$4.21B
| $6.49M | ﹤0.01% |
75,900
+32,600
| +75% | +$3.04M |
|
1245
PUT
NXP Semiconductors
NXPI
$68.1B
| $6.49M | ﹤0.01% |
28,500
-4,700
| -14% | -$1.06M |
|
1246
PUT
Golar LNG
GLNG
$5B
| $6.49M | ﹤0.01% |
160,500
+24,100
| +18% | +$996K |
|
1247
CALL
Novavax
NVAX
$1.24B
| $6.48M | ﹤0.01% |
747,600
+120,500
| +19% | +$938K |
|
|
ARR
1248
PUT
Armour Residential REIT
ARR
$2.02B
| $6.48M | ﹤0.01% |
433,700
+365,100
| +532% | +$5.73M |
|
1249
PUT
United States Antimony
UAMY
$774M
| $6.48M | ﹤0.01% |
1,045,100
+1,034,900
| +10,146% | +$4.32M |
|
|
PPTA
1250
CALL
Perpetua Resources
PPTA
$2.21B
| $6.47M | ﹤0.01% |
319,700
-113,900
| -26% | -$1.92M |
|
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.