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 | |
|---|---|---|---|---|---|---|
1251
CALL
Cognizant
CTSH
$21.5B
| $6.46M | ﹤0.01% |
96,400
+29,300
| +44% | +$2.12M |
|
1252
PUT
Oneok
OKE
$58.7B
| $6.46M | ﹤0.01% |
88,600
+19,300
| +28% | +$1.48M |
|
1253
PUT
Toyota
TM
$210B
| $6.46M | ﹤0.01% |
33,800
-300
| -0.9% | -$56.5K |
|
1254
CALL
Brookfield
BN
$102B
| $6.44M | ﹤0.01% |
140,850
-52,650
| -27% | -$2.33M |
|
1255
PUT
Enovix
ENVX
$862M
| $6.44M | ﹤0.01% |
645,800
+308,200
| +91% | +$3.41M |
|
1256
CALL
Cytokinetics
CYTK
$11B
| $6.43M | ﹤0.01% |
117,100
-46,100
| -28% | -$1.9M |
|
1257
PUT
2x Long VIX Futures ETF
UVIX
$286M
| $6.43M | ﹤0.01% |
27,440
+5,880
| +27% | +$1.76M |
|
1258
CALL
Agilent Technologies
A
$39.1B
| $6.43M | ﹤0.01% |
50,100
+20,500
| +69% | +$2.48M |
|
1259
PUT
McCormick & Company Non-Voting
MKC
$13.4B
| $6.42M | ﹤0.01% |
96,000
+57,000
| +146% | +$3.99M |
|
1260
CALL
Unilever
UL
$131B
| $6.4M | ﹤0.01% |
95,911
+21,244
| +28% | +$1.47M |
|
|
TIGR
1261
UP Fintech Holding
TIGR
$845M
| $6.39M | ﹤0.01% |
599,122
+94,953
| +19% | +$1.02M |
|
1262
WIX.com
WIX
$2.15B
| $6.39M | ﹤0.01% |
35,985
+28,954
| +412% | +$4.36M |
|
1263
PUT
Lattice Semiconductor
LSCC
$17.6B
| $6.39M | ﹤0.01% |
87,100
-49,500
| -36% | -$3.01M |
|
1264
PUT
Ramaco Resources Class A
METC
$676M
| $6.38M | ﹤0.01% |
192,400
-84,900
| -31% | -$1.97M |
|
1265
CALL
Tyson Foods
TSN
$20.2B
| $6.38M | ﹤0.01% |
117,500
-5,900
| -5% | -$326K |
|
1266
CALL
CenterPoint Energy
CNP
$29.1B
| $6.36M | ﹤0.01% |
163,900
+11,700
| +8% | +$442K |
|
|
HOLX
1267
PUT
DELISTED
Hologic
HOLX
| $6.36M | ﹤0.01% |
94,200
+27,500
| +41% | +$1.83M |
|
1268
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $6.33M | ﹤0.01% |
13,800
+8,600
| +165% | +$3.21M |
|
1269
PUT
Pagaya Technologies
PGY
$1.32B
| $6.32M | ﹤0.01% |
212,900
+173,700
| +443% | +$5.61M |
|
1270
CALL
Rexford Industrial Realty
REXR
$8.8B
| $6.31M | ﹤0.01% |
153,400
+9,300
| +6% | +$364K |
|
1271
CALL
Paychex
PAYX
$40.4B
| $6.3M | ﹤0.01% |
49,700
-900
| -2% | -$125K |
|
1272
PUT
Quanta Services
PWR
$93.9B
| $6.3M | ﹤0.01% |
15,200
+3,300
| +28% | +$1.28M |
|
1273
CALL
Best Buy
BBY
$18B
| $6.29M | ﹤0.01% |
83,200
-3,400
| -4% | -$244K |
|
1274
PUT
Viasat
VSAT
$9.79B
| $6.26M | ﹤0.01% |
213,800
-63,500
| -23% | -$1.52M |
|
1275
State Street SPDR S&P Homebuilders ETF
XHB
$1.74B
| $6.25M | ﹤0.01% |
56,422
+21,652
| +62% | +$2.37M |
|
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.