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 | |
|---|---|---|---|---|---|---|
6526
CALL
Suzano
SUZ
$10.2B
| $47K | ﹤0.01% |
5,100
-1,100
| -18% | -$10.4K |
|
6527
CALL
Tarsus Pharmaceuticals
TARS
$2.55B
| $47K | ﹤0.01% |
800
+500
| +167% | +$24.6K |
|
6528
PUT
VirTra
VTSI
$33.1M
| $47K | ﹤0.01% |
9,000
+100
| +1% | +$603 |
|
6529
BBB Foods
TBBB
$4.76B
| $47K | ﹤0.01% |
1,754
-5,636
| -76% | -$146K |
|
|
CTEV
6530
CALL
Claritev Corp
CTEV
$399M
| $47K | ﹤0.01% |
900
+600
| +200% | +$33.1K |
|
6531
CALL
Abeona Therapeutics
ABEO
$355M
| $46K | ﹤0.01% |
8,800
-15,500
| -64% | -$98.3K |
|
6532
Arcosa
ACA
$7.11B
| $46K | ﹤0.01% |
498
-294
| -37% | -$27.3K |
|
6533
CALL
Annexon
ANNX
$796M
| $46K | ﹤0.01% |
15,300
+13,200
| +629% | +$32.8K |
|
6534
CALL
Coca-Cola Consolidated
COKE
$12.8B
| $46K | ﹤0.01% |
400
+200
| +100% | +$23.2K |
|
|
6535
PUT
Coca-Cola Consolidated
COKE
$12.8B
| $46K | ﹤0.01% |
+400
| New | +$46.3K |
|
6536
PUT
Corsair Gaming
CRSR
$1.1B
| $46K | ﹤0.01% |
5,200
+3,500
| +206% | +$31.5K |
|
6537
PUT
Eagle Materials
EXP
$6.49B
| $46K | ﹤0.01% |
200
+100
| +100% | +$22.7K |
|
6538
Forum Energy Technologies
FET
$578M
| $46K | ﹤0.01% |
+1,733
| New | +$40K |
|
6539
F&G Annuities & Life
FG
$3.91B
| $46K | ﹤0.01% |
1,483
+1,279
| +627% | +$42.2K |
|
6540
PUT
Ituran Location and Control
ITRN
$1.08B
| $46K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$45.3K |
|
6541
CALL
Kaiser Aluminum
KALU
$2.48B
| $46K | ﹤0.01% |
+600
| New | +$47.7K |
|
|
LOMA
6542
Loma Negra
LOMA
$1.34B
| $46K | ﹤0.01% |
6,251
-6,376
| -50% | -$63.4K |
|
6543
Mativ Holdings
MATV
$479M
| $46K | ﹤0.01% |
+4,136
| New | +$41K |
|
6544
Mitek Systems
MITK
$756M
| $46K | ﹤0.01% |
4,742
+3,144
| +197% | +$30.9K |
|
6545
Everspin Technologies
MRAM
$303M
| $46K | ﹤0.01% |
5,032
+3,574
| +245% | +$24.3K |
|
6546
Perdoceo Education
PRDO
$2.17B
| $46K | ﹤0.01% |
1,246
+892
| +252% | +$28.6K |
|
6547
PUT
Reynolds Consumer Products
REYN
$5.42B
| $46K | ﹤0.01% |
+1,900
| New | +$43K |
|
|
SJT
6548
San Juan Basin Royalty Trust
SJT
$119M
| $46K | ﹤0.01% |
+7,677
| New | +$45.1K |
|
6549
Stantec
STN
$8.17B
| $46K | ﹤0.01% |
429
+128
| +43% | +$14K |
|
6550
CALL
Transportadora de Gas del Sur
TGS
$4.48B
| $46K | ﹤0.01% |
2,200
+300
| +16% | +$7.76K |
|
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.