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 | |
|---|---|---|---|---|---|---|
|
THS
3101
PUT
DELISTED
Treehouse Foods
THS
| $955K | ﹤0.01% |
47,300
+41,000
| +651% | +$777K |
|
3102
CALL
American Battery Technology Co
ABAT
$310M
| $954K | ﹤0.01% |
196,400
-6,800
| -3% | -$17.8K |
|
3103
CALL
Alcon
ALC
$32.8B
| $953K | ﹤0.01% |
12,800
+10,600
| +482% | +$885K |
|
3104
CALL
Smith & Wesson
SWBI
$666M
| $952K | ﹤0.01% |
96,900
+55,900
| +136% | +$477K |
|
3105
CALL
Freshworks
FRSH
$2.99B
| $951K | ﹤0.01% |
80,800
+1,300
| +2% | +$17.5K |
|
3106
PUT
Flywire
FLYW
$1.99B
| $950K | ﹤0.01% |
70,200
+63,400
| +932% | +$780K |
|
3107
PUT
Grocery Outlet
GO
$932M
| $950K | ﹤0.01% |
59,200
+56,100
| +1,810% | +$896K |
|
3108
CALL
Heritage Insurance Holdings
HRTG
$864M
| $949K | ﹤0.01% |
37,700
+32,400
| +611% | +$736K |
|
3109
Varonis Systems
VRNS
$5.36B
| $949K | ﹤0.01% |
+16,514
| New | +$916K |
|
3110
PUT
Papa John's
PZZA
$997M
| $948K | ﹤0.01% |
19,700
-23,600
| -55% | -$1.09M |
|
3111
Peloton Interactive
PTON
$2.71B
| $947K | ﹤0.01% |
105,307
+55,898
| +113% | +$416K |
|
3112
PUT
Icon
ICLR
$13B
| $945K | ﹤0.01% |
+5,400
| New | +$904K |
|
|
SAFE
3113
Safehold
SAFE
$1.19B
| $945K | ﹤0.01% |
+61,026
| New | +$943K |
|
3114
PUT
Cars.com
CARS
$660M
| $944K | ﹤0.01% |
+77,300
| New | +$992K |
|
3115
PUT
Ambev
ABEV
$47.4B
| $943K | ﹤0.01% |
423,100
+800
| +0.2% | +$1.83K |
|
|
PRMB
3116
CALL
Primo Brands
PRMB
$8.29B
| $943K | ﹤0.01% |
42,700
-194,600
| -82% | -$5.04M |
|
3117
PUT
Kosmos Energy
KOS
$1.45B
| $942K | ﹤0.01% |
567,600
-25,000
| -4% | -$46.8K |
|
3118
CALL
APi Group
APG
$17.3B
| $941K | ﹤0.01% |
+27,400
| New | +$956K |
|
3119
PUT
FuelCell Energy
FCEL
$1.72B
| $941K | ﹤0.01% |
120,700
+47,300
| +64% | +$257K |
|
|
OTLY
3120
PUT
Oatly Group
OTLY
$447M
| $941K | ﹤0.01% |
58,100
-21,700
| -27% | -$349K |
|
3121
CALL
SM Energy
SM
$7.26B
| $941K | ﹤0.01% |
37,700
+24,400
| +183% | +$658K |
|
|
NMAX
3122
PUT
Newsmax Inc
NMAX
$998M
| $941K | ﹤0.01% |
75,900
+26,800
| +55% | +$362K |
|
3123
CALL
Kopin
KOPN
$687M
| $940K | ﹤0.01% |
387,100
+195,100
| +102% | +$398K |
|
3124
CALL
Harrow
HROW
$1.4B
| $939K | ﹤0.01% |
19,500
-1,100
| -5% | -$41.4K |
|
3125
PUT
Tower Semiconductor
TSEM
$25.3B
| $939K | ﹤0.01% |
13,000
+9,200
| +242% | +$502K |
|
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.