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 | |
|---|---|---|---|---|---|---|
6501
CALL
Sun Life Financial
SLF
$45.6B
| $48K | ﹤0.01% |
800
+600
| +300% | +$36.1K |
|
6502
VEON
VEON
$3.5B
| $48K | ﹤0.01% |
899
-3,348
| -79% | -$180K |
|
6503
CALL
Affiliated Managers Group
AMG
$9.51B
| $47K | ﹤0.01% |
+200
| New | +$44.1K |
|
6504
PUT
Arbe Robotics
ARBE
$73.3M
| $47K | ﹤0.01% |
28,500
+13,900
| +95% | +$20.3K |
|
6505
CALL
Arcos Dorados Holdings
ARCO
$1.74B
| $47K | ﹤0.01% |
7,000
-5,000
| -42% | -$35.5K |
|
6506
CALL
Corporacion America
CAAP
$4.17B
| $47K | ﹤0.01% |
2,600
-2,400
| -48% | -$48.3K |
|
6507
PUT
Commerce Bancshares
CBSH
$8.68B
| $47K | ﹤0.01% |
+840
| New | +$49.4K |
|
6508
CALL
CBIZ
CBZ
$2.98B
| $47K | ﹤0.01% |
+900
| New | +$58K |
|
6509
PUT
Compañía de Cervecerías Unidas
CCU
$2.14B
| $47K | ﹤0.01% |
3,900
-1,600
| -29% | -$19.6K |
|
|
CLDT
6510
Chatham Lodging
CLDT
$632M
| $47K | ﹤0.01% |
7,137
-160
| -2% | -$1.15K |
|
|
CTO
6511
PUT
CTO Realty Growth
CTO
$839M
| $47K | ﹤0.01% |
2,900
-3,500
| -55% | -$59.1K |
|
6512
PUT
International Money Express
IMXI
$389M
| $47K | ﹤0.01% |
3,400
-2,300
| -40% | -$28.5K |
|
6513
Direxion Daily MSCI India Bull 2X ETF
INDL
$55.5M
| $47K | ﹤0.01% |
888
+691
| +351% | +$39.9K |
|
6514
Lineage Cell Therapeutics
LCTX
$264M
| $47K | ﹤0.01% |
+28,017
| New | +$33.2K |
|
6515
PUT
LivaNova
LIVN
$4.47B
| $47K | ﹤0.01% |
900
-200
| -18% | -$10.1K |
|
6516
CALL
MeiraGTx Holdings
MGTX
$1.08B
| $47K | ﹤0.01% |
5,800
-5,900
| -50% | -$46.7K |
|
6517
PUT
Mitsubishi UFJ Financial
MUFG
$247B
| $47K | ﹤0.01% |
3,000
-27,600
| -90% | -$409K |
|
|
NEXN
6518
CALL
Nexxen International
NEXN
$588M
| $47K | ﹤0.01% |
5,100
+200
| +4% | +$1.98K |
|
|
OPI
6519
CALL
DELISTED
Office Properties Income Trust
OPI
| $47K | ﹤0.01% |
+490,400
| New | +$145K |
|
6520
Pool Corp
POOL
$7.05B
| $47K | ﹤0.01% |
+153
| New | +$48K |
|
6521
Procept Biorobotics
PRCT
$1.02B
| $47K | ﹤0.01% |
1,336
-396
| -23% | -$18.1K |
|
6522
Scansource
SCSC
$1.17B
| $47K | ﹤0.01% |
+1,085
| New | +$46.2K |
|
6523
PUT
Spectrum Brands
SPB
$2.03B
| $47K | ﹤0.01% |
900
-4,600
| -84% | -$255K |
|
|
STKL
6524
CALL
DELISTED
SunOpta
STKL
| $47K | ﹤0.01% |
8,100
-2,800
| -26% | -$17.4K |
|
6525
CALL
Stoke Therapeutics
STOK
$1.84B
| $47K | ﹤0.01% |
2,000
-500
| -20% | -$8.57K |
|
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.