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 | |
|---|---|---|---|---|---|---|
5576
Televisa
TV
$1.48B
| $116K | ﹤0.01% |
43,229
-48,432
| -53% | -$122K |
|
5577
PUT
Wave Life Sciences
WVE
$1.09B
| $116K | ﹤0.01% |
15,900
+13,200
| +489% | +$107K |
|
|
SUNS
5578
CALL
Sunrise Realty Trust
SUNS
$106M
| $116K | ﹤0.01% |
11,200
+1,000
| +10% | +$10.7K |
|
|
TVRD
5579
Tvardi Therapeutics
TVRD
$19.7M
| $116K | ﹤0.01% |
+2,988
| New | +$85.1K |
|
5580
CALL
Douglas Elliman
DOUG
$154M
| $115K | ﹤0.01% |
+40,400
| New | +$106K |
|
5581
CALL
VanEck Energy Income ETF
EINC
$78.2M
| $115K | ﹤0.01% |
2,400
-2,600
| -52% | -$251K |
|
5582
PUT
F&G Annuities & Life
FG
$3.79B
| $115K | ﹤0.01% |
3,700
+2,900
| +363% | +$95.8K |
|
5583
CALL
1-800-Flowers.com
FLWS
$250M
| $115K | ﹤0.01% |
25,100
-76,100
| -75% | -$420K |
|
5584
PUT
ThredUp
TDUP
$746M
| $115K | ﹤0.01% |
12,200
+11,200
| +1,120% | +$106K |
|
5585
PUT
Westlake Corp
WLK
$9.03B
| $115K | ﹤0.01% |
1,500
-900
| -38% | -$75K |
|
|
CRWU
5586
T-REX 2X Long CRWV Daily Target ETF
CRWU
$24M
| $115K | ﹤0.01% |
+4,630
| New | +$86K |
|
5587
CALL
ProFrac Holding
ACDC
$731M
| $114K | ﹤0.01% |
31,000
+14,500
| +88% | +$79.9K |
|
5588
YieldMax AMD Option Income Strategy ETF
AMDY
$382M
| $114K | ﹤0.01% |
2,975
+2,077
| +231% | +$85.4K |
|
5589
PUT
Aemetis
AMTX
$106M
| $114K | ﹤0.01% |
51,100
-46,500
| -48% | -$123K |
|
5590
CALL
Brookdale Senior Living
BKD
$3.49B
| $114K | ﹤0.01% |
13,500
+12,500
| +1,250% | +$95.3K |
|
5591
PUT
Dream Finders Homes
DFH
$1.16B
| $114K | ﹤0.01% |
4,400
-11,900
| -73% | -$327K |
|
5592
CALL
Ranpak Holdings
PACK
$439M
| $114K | ﹤0.01% |
+20,300
| New | +$88.9K |
|
5593
PUT
Phinia Inc
PHIN
$2.7B
| $114K | ﹤0.01% |
2,000
| – | – |
|
5594
CALL
Real Brokerage
REAX
$349M
| $114K | ﹤0.01% |
27,400
-30,400
| -53% | -$137K |
|
|
SMCY
5595
YieldMax SMCI Option Income Strategy ETF
SMCY
$105M
| $114K | ﹤0.01% |
7,388
-119
| -2% | -$2.12K |
|
5596
Aspen Aerogels
ASPN
$384M
| $113K | ﹤0.01% |
16,251
+15,198
| +1,443% | +$107K |
|
5597
Range Global Coal Index ETF
COAL
$48M
| $113K | ﹤0.01% |
5,107
+4,617
| +942% | +$93.5K |
|
5598
CALL
Descartes Systems
DSGX
$6.44B
| $113K | ﹤0.01% |
1,200
-100
| -8% | -$10.2K |
|
5599
CALL
Immatics
IMTX
$1.18B
| $113K | ﹤0.01% |
13,300
-61,200
| -82% | -$377K |
|
5600
PUT
OrthoPediatrics
KIDS
$519M
| $113K | ﹤0.01% |
+6,100
| New | +$126K |
|
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.