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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
3351
CALL
Relay Therapeutics
RLAY
$3.99B
| $592K | ﹤0.01% |
32,800
+25,300
| +337% | +$485K |
2025 Q1
6 quarters
|
|
3352
CALL
Commerce Bancshares
CBSH
$7.87B
| $591K | ﹤0.01% |
+10,800
| New | +$630K |
2026 Q3
0 quarters
|
|
3353
PUT
Rhythm Pharmaceuticals
RYTM
$7.62B
| $590K | ﹤0.01% |
6,200
-100
| -2% | -$10.7K |
2020 Q3
24 quarters
|
|
3354
CALL
Sana Biotechnology
SANA
$602M
| $590K | ﹤0.01% |
202,400
-18,900
| -9% | -$65.8K |
2024 Q1
10 quarters
|
|
3355
Almonty Industries
ALM
$2.2B
| $590K | ﹤0.01% |
44,827
+23,748
| +113% | +$357K |
2026 Q1
2 quarters
|
|
3356
Generac Holdings
GNRC
$11.4B
| $590K | ﹤0.01% |
2,850
-1,286
| -31% | -$267K |
2026 Q2
1 quarter
|
|
3357
Dropbox
DBX
$7.21B
| $589K | ﹤0.01% |
+17,393
| New | +$576K |
2026 Q3
0 quarters
|
|
3358
CALL
Sumitomo Mitsui Financial Group, Inc American Depositary Shares (each representing 1.2 shares of Common Stock)
SMFG
$153B
| $588K | ﹤0.01% |
22,700
+19,200
| +549% | +$497K |
2026 Q1
2 quarters
|
|
3359
PUT
Matador Resources
MTDR
$6.54B
| $588K | ﹤0.01% |
11,400
+2,200
| +24% | +$119K |
2014 Q4
47 quarters
|
|
3360
CALL
Lithium Argentina AG
LAR
$612M
| $588K | ﹤0.01% |
106,900
-34,500
| -24% | -$223K |
2025 Q3
4 quarters
|
|
3361
Texas Roadhouse
TXRH
$12.2B
| $587K | ﹤0.01% |
3,757
-3,283
| -47% | -$627K |
2026 Q2
1 quarter
|
|
3362
Lamb Weston
LW
$7.61B
| $587K | ﹤0.01% |
14,078
-9,763
| -41% | -$484K |
2025 Q3
4 quarters
|
|
3363
CALL
Karman Holdings
KRMN
$5.37B
| $587K | ﹤0.01% |
18,100
-2,700
| -13% | -$126K |
2025 Q3
4 quarters
|
|
3364
Compass
COMP
$7.7B
| $585K | ﹤0.01% |
65,925
-1,149
| -2% | -$13K |
2025 Q4
3 quarters
|
|
3365
CALL
Thomson Reuters
TRI
$47.4B
| $584K | ﹤0.01% |
6,000
-20,900
| -78% | -$2.07M |
2017 Q4
35 quarters
|
|
3366
PUT
Sezzle
SEZL
$5.23B
| $583K | ﹤0.01% |
5,400
-30,200
| -85% | -$4.21M |
2025 Q2
5 quarters
|
|
3367
CALL
Avino Silver & Gold Mines
ASM
$746M
| $583K | ﹤0.01% |
105,100
+46,000
| +78% | +$297K |
2026 Q1
2 quarters
|
|
3368
Rollins
ROL
$18.1B
| $582K | ﹤0.01% |
19,309
-47
| -0.2% | -$1.77K |
2026 Q2
1 quarter
|
|
3369
Global X Cybersecurity ETF
BUG
$2.06B
| $582K | ﹤0.01% |
12,593
-2,617
| -17% | -$109K |
2023 Q2
13 quarters
|
|
3370
Regal Rexnord
RRX
$12B
| $582K | ﹤0.01% |
3,749
-1,932
| -34% | -$349K |
2025 Q1
6 quarters
|
|
3371
PUT
Sundial Growers
SNDL
$340M
| $581K | ﹤0.01% |
450,600
-53,600
| -11% | -$70.7K |
2020 Q3
24 quarters
|
|
3372
CALL
Penske Automotive Group
PAG
$14B
| $581K | ﹤0.01% |
2,900
+2,700
| +1,350% | +$568K |
2016 Q1
42 quarters
|
|
3373
PUT
Shoe Station Group
SHOE
$386M
| $581K | ﹤0.01% |
45,400
+44,400
| +4,440% | +$641K |
2020 Q4
23 quarters
|
|
3374
PUT
Heritage Insurance Holdings
HRTG
$993M
| $580K | ﹤0.01% |
17,500
+4,400
| +34% | +$139K |
2026 Q1
2 quarters
|
|
3375
PUT
TG Therapeutics
TGTX
$9.8B
| $580K | ﹤0.01% |
10,400
-102,700
| -91% | -$5.56M |
2021 Q2
21 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.