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 | |
|---|---|---|---|---|---|---|
|
EWCZ
6076
PUT
DELISTED
European Wax Center
EWCZ
| $73K | ﹤0.01% |
+18,400
| New | +$84K |
|
6077
PUT
IDEAYA Biosciences
IDYA
$3.5B
| $73K | ﹤0.01% |
2,700
+2,600
| +2,600% | +$62.9K |
|
6078
CALL
908 Devices
MASS
$313M
| $73K | ﹤0.01% |
8,400
-1,200
| -13% | -$7.97K |
|
6079
CALL
Pediatrix Medical
MD
$2.17B
| $73K | ﹤0.01% |
4,400
+1,000
| +29% | +$15K |
|
6080
CALL
Radiant Logistics
RLGT
$388M
| $73K | ﹤0.01% |
12,400
-4,900
| -28% | -$30.2K |
|
6081
The Bancorp
TBBK
$2.7B
| $73K | ﹤0.01% |
+982
| New | +$68.5K |
|
|
TGNA
6082
CALL
DELISTED
TEGNA Inc
TGNA
| $73K | ﹤0.01% |
3,600
-4,600
| -56% | -$87.7K |
|
6083
Vanguard Short-Term Corporate Bond ETF
VCSH
$44.8B
| $73K | ﹤0.01% |
+918
| New | +$73K |
|
6084
Yum China
YUMC
$15.9B
| $73K | ﹤0.01% |
1,718
-19,033
| -92% | -$865K |
|
6085
GraniteShares 2x Long AAPL Daily ETF
AAPB
$19.6M
| $72K | ﹤0.01% |
2,435
+1,137
| +88% | +$27.4K |
|
6086
Ambev
ABEV
$48.2B
| $72K | ﹤0.01% |
32,439
+12,470
| +62% | +$28.5K |
|
|
GOLD
6087
PUT
Gold.com Inc
GOLD
$1.22B
| $72K | ﹤0.01% |
2,800
+2,200
| +367% | +$52K |
|
|
CMRC
6088
CALL
Commerce.com Inc Series 1
CMRC
$261M
| $72K | ﹤0.01% |
14,500
-500
| -3% | -$2.4K |
|
|
BRT
6089
BRT Apartments
BRT
$284M
| $72K | ﹤0.01% |
4,619
+4,449
| +2,617% | +$69.5K |
|
6090
AGF US Market Neutral Anti-Beta Fund
BTAL
$305M
| $72K | ﹤0.01% |
4,574
+3,676
| +409% | +$60.6K |
|
6091
Collegium Pharmaceutical
COLL
$1.17B
| $72K | ﹤0.01% |
2,064
+349
| +20% | +$12.1K |
|
6092
PUT
Energy Recovery
ERII
$435M
| $72K | ﹤0.01% |
4,700
+4,300
| +1,075% | +$60.6K |
|
6093
PUT
Extreme Networks
EXTR
$3.9B
| $72K | ﹤0.01% |
3,500
-1,700
| -33% | -$33.8K |
|
6094
CALL
Federated Hermes
FHI
$4.51B
| $72K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$65.9K |
|
6095
CALL
Golub Capital BDC
GBDC
$3.34B
| $72K | ﹤0.01% |
5,300
+2,200
| +71% | +$32.4K |
|
6096
PUT
GoodRx Holdings
GDRX
$1.07B
| $72K | ﹤0.01% |
17,100
+11,600
| +211% | +$51K |
|
6097
ProShares UltraShort Gold
GLL
$123M
| $72K | ﹤0.01% |
+2,190
| New | +$90.2K |
|
6098
Hexcel
HXL
$7.78B
| $72K | ﹤0.01% |
1,156
+233
| +25% | +$14.3K |
|
|
KNDI
6099
PUT
Kandi Technologies Group
KNDI
$65.7M
| $72K | ﹤0.01% |
60,100
+28,000
| +87% | +$36.2K |
|
6100
PUT
Milestone Pharmaceuticals
MIST
$143M
| $72K | ﹤0.01% |
36,200
+29,200
| +417% | +$51.3K |
|
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.