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 | |
|---|---|---|---|---|---|---|
401
PUT
Oscar Health
OSCR
$8.89B
| $41.4M | 0.02% |
2,189,100
+1,187,200
| +118% | +$19.6M |
|
402
CALL
Celestica
CLS
$38.6B
| $41.3M | 0.02% |
167,700
-43,400
| -21% | -$8.75M |
|
403
PUT
CleanSpark
CLSK
$3.93B
| $41.3M | 0.02% |
2,848,300
+607,300
| +27% | +$6.85M |
|
404
CALL
Moderna
MRNA
$23B
| $41.1M | 0.02% |
1,592,000
+627,800
| +65% | +$17.5M |
|
405
CALL
Constellation Energy
CEG
$98.2B
| $41.1M | 0.02% |
151,700
-48,400
| -24% | -$15.6M |
|
406
CALL
Vale
VALE
$63.2B
| $40.7M | 0.02% |
3,744,300
+1,030,000
| +38% | +$10.5M |
|
407
PUT
Wynn Resorts
WYNN
$9.79B
| $40.5M | 0.02% |
315,800
+37,000
| +13% | +$4.27M |
|
408
PUT
Unity
U
$12.8B
| $40.3M | 0.02% |
1,136,600
+588,200
| +107% | +$21.8M |
|
409
CALL
Bakkt Inc
BKKT
$356M
| $40.1M | 0.02% |
+1,192,500
| New | +$16.4M |
|
410
PUT
Etsy
ETSY
$7.64B
| $40.1M | 0.02% |
603,900
+148,700
| +33% | +$8.88M |
|
411
CALL
Cameco
CCJ
$39.4B
| $39.9M | 0.02% |
476,100
-468,200
| -50% | -$36.3M |
|
412
PUT
United States Oil Fund
USO
$2.36B
| $39.7M | 0.02% |
538,800
+86,200
| +19% | +$6.47M |
|
413
CALL
Rigetti Computing
RGTI
$5.06B
| $39.7M | 0.02% |
1,332,000
-247,300
| -16% | -$4.34M |
|
414
PUT
Capital One
COF
$124B
| $39.7M | 0.02% |
186,600
-35,600
| -16% | -$7.79M |
|
415
CALL
British American Tobacco
BTI
$134B
| $39.1M | 0.02% |
736,300
+276,400
| +60% | +$15M |
|
416
CALL
SoundHound AI
SOUN
$2.81B
| $39M | 0.02% |
2,427,600
+1,531,200
| +171% | +$20.3M |
|
417
PUT
Quantum Computing Inc
QUBT
$1.78B
| $38.9M | 0.02% |
2,110,900
+746,700
| +55% | +$12.8M |
|
418
Micron Technology
MU
$1.08T
| $38.8M | 0.02% |
231,613
-384,566
| -62% | -$49.2M |
|
419
CALL
eBay
EBAY
$49.3B
| $38.7M | 0.02% |
425,600
-46,300
| -10% | -$4.1M |
|
420
PUT
Cipher Digital
CIFR
$10B
| $38.6M | 0.02% |
3,069,300
+2,091,600
| +214% | +$15.8M |
|
421
Cigna
CI
$75.4B
| $38.4M | 0.02% |
133,228
+56,367
| +73% | +$16.7M |
|
422
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $38.4M | 0.02% |
1,162,900
+152,600
| +15% | +$4.41M |
|
423
PUT
Accenture
ACN
$85.7B
| $38.2M | 0.02% |
154,900
+65,400
| +73% | +$17.1M |
|
424
PUT
Kenvue
KVUE
$36.7B
| $38.1M | 0.02% |
2,348,900
+1,612,900
| +219% | +$32.9M |
|
425
PUT
Lowe's Companies
LOW
$115B
| $37.9M | 0.02% |
151,000
-21,000
| -12% | -$5.16M |
|
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.