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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 | |
|---|---|---|---|---|---|---|---|
4301
CALL
Nabors Industries
NBR
$1.34B
| $266K | ﹤0.01% |
3,400
-500
| -13% | -$42.8K |
2020 Q2
25 quarters
|
|
4302
CALL
DELISTED
Atkore
ATKR
| $265K | ﹤0.01% |
2,800
-1,100
| -28% | -$95.3K |
2018 Q4
31 quarters
|
|
4303
PUT
JOYY Inc
JOYY
$3.92B
| $265K | ﹤0.01% |
3,300
+2,300
| +230% | +$171K |
2021 Q1
22 quarters
|
|
4304
PUT
CryoPort
CYRX
$992M
| $264K | ﹤0.01% |
15,200
+12,300
| +424% | +$196K |
2019 Q4
27 quarters
|
|
4305
PUT
Intapp
INTA
$3.54B
| $264K | ﹤0.01% |
+7,300
| New | +$257K |
2026 Q3
0 quarters
|
|
4306
PepGen
PEPG
$309M
| $264K | ﹤0.01% |
+109,211
| New | +$283K |
2026 Q3
0 quarters
|
|
4307
PUT
Elemental Royalty Corp
ELE
$1.09B
| $264K | ﹤0.01% |
13,800
+800
| +6% | +$15.2K |
2026 Q2
1 quarter
|
|
4308
CALL
Kilroy Realty
KRC
$4.14B
| $263K | ﹤0.01% |
7,900
-13,200
| -63% | -$489K |
2026 Q2
1 quarter
|
|
4309
PUT
Jade Biosciences
JBIO
$1.03B
| $263K | ﹤0.01% |
18,700
| – | – |
2024 Q4
7 quarters
|
|
4310
Celldex Therapeutics
CLDX
$2.25B
| $263K | ﹤0.01% |
+8,104
| New | +$310K |
2026 Q3
0 quarters
|
|
4311
Global X Data Center & Digital Infrastructure ETF
DTCR
$1.86B
| $262K | ﹤0.01% |
9,672
-12,627
| -57% | -$355K |
2025 Q3
4 quarters
|
|
4312
CALL
Xtend AI Robotics, Inc.
XTND
$341M
| $262K | ﹤0.01% |
+73,700
| New | +$328K |
2026 Q3
0 quarters
|
|
4313
PUT
Danaos Corp
DAC
$2.73B
| $262K | ﹤0.01% |
1,700
+1,400
| +467% | +$202K |
2020 Q4
23 quarters
|
|
|
HTGCR
4314
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $262K | ﹤0.01% |
15,600
-36,400
| -70% | -$612K |
2018 Q1
34 quarters
|
|
4315
CALL
Smithfield Foods
SFD
$7.64B
| $262K | ﹤0.01% |
14,000
+13,900
| +13,900% | +$321K |
2025 Q2
5 quarters
|
|
4316
PUT
Disc Medicine
IRON
$3.71B
| $262K | ﹤0.01% |
+4,000
| New | +$302K |
2026 Q3
0 quarters
|
|
4317
Harmony Gold Mining
HMY
$9.47B
| $262K | ﹤0.01% |
14,772
-38,820
| -72% | -$709K |
2025 Q2
5 quarters
|
|
4318
PUT
Morgan Stanley Direct Lending Fund
MSDL
$1.15B
| $262K | ﹤0.01% |
19,200
+7,700
| +67% | +$116K |
2026 Q1
2 quarters
|
|
4319
Teucrium Agricultural Fund
TAGS
$17.1M
| $261K | ﹤0.01% |
9,629
-286
| -3% | -$7.57K |
2026 Q1
2 quarters
|
|
4320
PUT
Amentum Holdings
AMTM
$5.33B
| $261K | ﹤0.01% |
14,400
-21,900
| -60% | -$459K |
2024 Q4
7 quarters
|
|
4321
PUT
Penske Automotive Group
PAG
$13.9B
| $260K | ﹤0.01% |
+1,300
| New | +$274K |
2026 Q3
0 quarters
|
|
4322
CALL
Gladstone Commercial Corp
GOOD
$481M
| $260K | ﹤0.01% |
20,600
+15,000
| +268% | +$192K |
2019 Q3
28 quarters
|
|
4323
CALL
United Natural Foods
UNFI
$2.91B
| $260K | ﹤0.01% |
5,800
-100
| -2% | -$4.71K |
2021 Q2
21 quarters
|
|
4324
Alto Neuroscience
ANRO
$1.21B
| $260K | ﹤0.01% |
+10,171
| New | +$305K |
2026 Q3
0 quarters
|
|
4325
PUT
United Parks & Resorts
PRKS
$1.82B
| $259K | ﹤0.01% |
8,000
+7,900
| +7,900% | +$334K |
2026 Q2
1 quarter
|
|
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.