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 | |
|---|---|---|---|---|---|---|
5401
B&G Foods
BGS
$287M
| $136K | ﹤0.01% |
30,841
-71,705
| -70% | -$313K |
|
5402
PUT
Braze
BRZE
$2.81B
| $136K | ﹤0.01% |
4,800
-900
| -16% | -$25.5K |
|
5403
CALL
Neogen
NEOG
$2.63B
| $136K | ﹤0.01% |
23,900
+22,200
| +1,306% | +$118K |
|
5404
UNIFI
UFI
$119M
| $136K | ﹤0.01% |
28,628
+23,659
| +476% | +$109K |
|
5405
CALL
AXT Inc
AXTI
$3.95B
| $135K | ﹤0.01% |
30,100
+29,000
| +2,636% | +$82.9K |
|
|
CRESY
5406
Cresud
CRESY
$795M
| $135K | ﹤0.01% |
14,889
-3,569
| -19% | -$36.7K |
|
5407
PUT
Invesco DB Commodity Index Tracking Fund
DBC
$1.69B
| $135K | ﹤0.01% |
6,000
-7,900
| -57% | -$176K |
|
5408
Globus Medical
GMED
$10.7B
| $135K | ﹤0.01% |
2,369
-3,351
| -59% | -$193K |
|
|
SNBR
5409
CALL
DELISTED
Sleep Number
SNBR
| $135K | ﹤0.01% |
19,300
-9,100
| -32% | -$79.7K |
|
|
VRNT
5410
CALL
DELISTED
Verint Systems
VRNT
| $135K | ﹤0.01% |
6,700
-5,800
| -46% | -$119K |
|
5411
Yext
YEXT
$547M
| $135K | ﹤0.01% |
15,941
+3,348
| +27% | +$28.4K |
|
5412
CALL
AngioDynamics
ANGO
$611M
| $134K | ﹤0.01% |
12,000
-4,100
| -25% | -$39.6K |
|
5413
Atea Pharmaceuticals
AVIR
$376M
| $134K | ﹤0.01% |
46,220
-14,364
| -24% | -$49K |
|
5414
CALL
Chemed
CHE
$7.07B
| $134K | ﹤0.01% |
300
+200
| +200% | +$90.6K |
|
5415
PUT
Evercore
EVR
$12.4B
| $134K | ﹤0.01% |
400
-1,000
| -71% | -$313K |
|
5416
CALL
Open Text
OTEX
$6.15B
| $134K | ﹤0.01% |
3,600
-25,200
| -88% | -$808K |
|
5417
Worthington Enterprises
WOR
$2.75B
| $134K | ﹤0.01% |
2,428
-11,185
| -82% | -$705K |
|
|
ABX
5418
Abacus Global Management
ABX
$989M
| $133K | ﹤0.01% |
23,284
+22,820
| +4,918% | +$136K |
|
5419
Ardagh Metal Packaging
AMBP
$2.83B
| $133K | ﹤0.01% |
33,581
+22,786
| +211% | +$90.7K |
|
5420
CALL
American Homes 4 Rent
AMH
$12B
| $133K | ﹤0.01% |
4,000
+200
| +5% | +$6.97K |
|
5421
CALL
Aemetis
AMTX
$106M
| $133K | ﹤0.01% |
59,500
+16,600
| +39% | +$44.1K |
|
5422
PUT
BTCS Inc
BTCS
$51.3M
| $133K | ﹤0.01% |
+27,700
| New | +$127K |
|
|
GPGI
5423
CALL
GPGI Inc
GPGI
$3.83B
| $133K | ﹤0.01% |
6,400
-57,700
| -90% | -$998K |
|
5424
PUT
Cardiff Oncology
CRDF
$66.5M
| $133K | ﹤0.01% |
64,600
-7,300
| -10% | -$20.2K |
|
5425
ProShares UltraShort Dow 30
DXD
$42.2M
| $133K | ﹤0.01% |
6,061
+1,987
| +49% | +$46.5K |
|
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.