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 | |
|---|---|---|---|---|---|---|
4001
PUT
Sally Beauty Holdings
SBH
$1.47B
| $433K | ﹤0.01% |
26,600
-9,200
| -26% | -$116K |
|
4002
Dentsply Sirona
XRAY
$2.78B
| $433K | ﹤0.01% |
+34,167
| New | +$496K |
|
4003
CALL
Candel Therapeutics
CADL
$683M
| $432K | ﹤0.01% |
84,800
+8,400
| +11% | +$48.5K |
|
4004
CALL
Silicon Laboratories
SLAB
$7.17B
| $432K | ﹤0.01% |
3,300
-8,100
| -71% | -$1.1M |
|
4005
CALL
Theravance Biopharma
TBPH
$876M
| $432K | ﹤0.01% |
+29,600
| New | +$374K |
|
|
KC
4006
Kingsoft Cloud Holdings
KC
$2.99B
| $431K | ﹤0.01% |
+28,922
| New | +$419K |
|
4007
PUT
Lufax Holding
LU
$1.33B
| $431K | ﹤0.01% |
106,300
+12,300
| +13% | +$36.7K |
|
4008
PUT
Weyerhaeuser
WY
$17.5B
| $431K | ﹤0.01% |
17,400
-66,400
| -79% | -$1.7M |
|
4009
PUT
AbCellera Biologics
ABCL
$1.62B
| $430K | ﹤0.01% |
85,500
+68,700
| +409% | +$303K |
|
4010
PUT
Brunswick
BC
$5.23B
| $430K | ﹤0.01% |
6,800
-4,600
| -40% | -$285K |
|
4011
Cincinnati Financial
CINF
$27.6B
| $430K | ﹤0.01% |
2,724
+1,879
| +222% | +$285K |
|
4012
PUT
Nokia
NOK
$47.8B
| $430K | ﹤0.01% |
89,600
-8,600
| -9% | -$38.9K |
|
4013
CALL
Northern Trust
NTRS
$22B
| $430K | ﹤0.01% |
3,200
-89,100
| -97% | -$11.5M |
|
4014
PUT
ProKidney
PROK
$310M
| $430K | ﹤0.01% |
+178,000
| New | +$474K |
|
|
NAKA
4015
Nakamoto Inc
NAKA
$76M
| $430K | ﹤0.01% |
+10,061
| New | +$3.19M |
|
4016
CALL
Axcelis
ACLS
$3.55B
| $429K | ﹤0.01% |
4,400
-3,900
| -47% | -$314K |
|
|
BORR
4017
CALL
Borr Drilling
BORR
$1.18B
| $429K | ﹤0.01% |
159,700
+109,700
| +219% | +$273K |
|
4018
PUT
Jack in the Box
JACK
$319M
| $429K | ﹤0.01% |
21,700
+5,600
| +35% | +$111K |
|
4019
CALL
Orion
OEC
$385M
| $429K | ﹤0.01% |
56,700
+11,700
| +26% | +$118K |
|
4020
PUT
Post Holdings
POST
$4.32B
| $429K | ﹤0.01% |
4,000
-1,100
| -22% | -$118K |
|
4021
CAVA Group
CAVA
$7.53B
| $428K | ﹤0.01% |
+7,099
| New | +$538K |
|
4022
PUT
Dana Inc
DAN
$2.9B
| $428K | ﹤0.01% |
21,400
-2,500
| -10% | -$46.4K |
|
4023
CALL
Seadrill
SDRL
$2.57B
| $428K | ﹤0.01% |
14,200
+12,000
| +545% | +$366K |
|
4024
Viatris
VTRS
$20.8B
| $428K | ﹤0.01% |
43,246
-118,980
| -73% | -$1.16M |
|
|
YQ
4025
PUT
17 Education & Technology Group
YQ
$19.6M
| $428K | ﹤0.01% |
+100,000
| New | +$245K |
|
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.