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 | |
|---|---|---|---|---|---|---|
4201
New Fortress Energy
NFE
$92.9M
| $373K | ﹤0.01% |
+168,952
| New | +$481K |
|
4202
PUT
abrdn Physical Silver Shares ETF
SIVR
$3.98B
| $373K | ﹤0.01% |
8,400
-7,200
| -46% | -$271K |
|
4203
CALL
Veritone
VERI
$92.9M
| $373K | ﹤0.01% |
77,500
+69,200
| +834% | +$200K |
|
4204
Xeris Biopharma Holdings
XERS
$1.45B
| $373K | ﹤0.01% |
45,931
-30,713
| -40% | -$204K |
|
|
TTAN
4205
PUT
ServiceTitan Inc
TTAN
$8.03B
| $373K | ﹤0.01% |
3,700
-3,600
| -49% | -$395K |
|
4206
Best Buy
BBY
$19B
| $372K | ﹤0.01% |
4,925
-130
| -3% | -$9.32K |
|
4207
CALL
Omeros
OMER
$845M
| $371K | ﹤0.01% |
90,500
+68,300
| +308% | +$271K |
|
4208
PENN Entertainment
PENN
$2.84B
| $371K | ﹤0.01% |
19,264
-26,863
| -58% | -$504K |
|
4209
CALL
Photronics
PLAB
$1.65B
| $371K | ﹤0.01% |
16,200
-700
| -4% | -$15K |
|
4210
PUT
AMC Global Media
AMCX
$450M
| $370K | ﹤0.01% |
45,000
-106,600
| -70% | -$739K |
|
4211
CALL
United States Copper Index Fund
CPER
$742M
| $369K | ﹤0.01% |
12,300
+4,500
| +58% | +$135K |
|
4212
PUT
Amdocs
DOX
$6.03B
| $369K | ﹤0.01% |
4,500
+4,400
| +4,400% | +$381K |
|
4213
PUT
Rexford Industrial Realty
REXR
$8.63B
| $369K | ﹤0.01% |
9,000
-7,900
| -47% | -$309K |
|
4214
CALL
Helmerich & Payne
HP
$3.34B
| $368K | ﹤0.01% |
16,700
-10,800
| -39% | -$199K |
|
4215
CALL
Titan International
TWI
$492M
| $368K | ﹤0.01% |
48,800
+41,800
| +597% | +$373K |
|
4216
CALL
Adeia
ADEA
$2.55B
| $367K | ﹤0.01% |
21,900
+21,400
| +4,280% | +$317K |
|
4217
CALL
Healthpeak Properties
DOC
$15.5B
| $367K | ﹤0.01% |
19,200
-28,200
| -59% | -$506K |
|
4218
Avantor
AVTR
$9.82B
| $365K | ﹤0.01% |
29,309
-147,600
| -83% | -$1.9M |
|
4219
CALL
MarketAxess Holdings
MKTX
$4.47B
| $365K | ﹤0.01% |
2,100
-5,000
| -70% | -$978K |
|
4220
CALL
NCR Atleos
NATL
$3.51B
| $365K | ﹤0.01% |
9,300
-1,300
| -12% | -$45.2K |
|
4221
PUT
Powell Industries
POWL
$6.79B
| $365K | ﹤0.01% |
3,600
-7,200
| -67% | -$611K |
|
|
JKS
4222
JinkoSolar
JKS
$764M
| $364K | ﹤0.01% |
+15,170
| New | +$358K |
|
|
ARIS
4223
Aris Mining
ARIS
$2.87B
| $363K | ﹤0.01% |
37,069
+35,514
| +2,284% | +$283K |
|
4224
Cognex
CGNX
$9.62B
| $363K | ﹤0.01% |
8,020
+4,858
| +154% | +$197K |
|
4225
CALL
Hilton Grand Vacations
HGV
$4.04B
| $363K | ﹤0.01% |
8,700
| – | – |
|
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.