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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 | |
|---|---|---|---|---|---|---|---|
3376
CALL
DELISTED
Churchill Capital Corp XI
CCXI
| $580K | ﹤0.01% |
+49,900
| New | +$719K |
2026 Q3
0 quarters
|
|
3377
CALL
Equity Bancshares
EQBK
$1.01B
| $580K | ﹤0.01% |
12,300
| – | – |
2026 Q2
1 quarter
|
|
3378
Fulgent Genetics
FLGT
$694M
| $580K | ﹤0.01% |
26,322
+25,689
| +4,058% | +$516K |
2026 Q2
1 quarter
|
|
3379
PUT
Pitney Bowes
PBI
$2.12B
| $579K | ﹤0.01% |
35,500
+5,700
| +19% | +$98.3K |
2014 Q4
47 quarters
|
|
3380
PUT
NGL Energy Partners
NGL
$1.95B
| $579K | ﹤0.01% |
39,300
-44,400
| -53% | -$730K |
2026 Q2
1 quarter
|
|
3381
CALL
Ferguson
FERG
$49.3B
| $579K | ﹤0.01% |
2,600
-4,500
| -63% | -$1.04M |
2022 Q2
17 quarters
|
|
3382
CALL
IES Holdings
IESC
$7.39B
| $578K | ﹤0.01% |
1,800
-600
| -25% | -$198K |
2024 Q1
10 quarters
|
|
3383
Kymera Therapeutics
KYMR
$10.9B
| $577K | ﹤0.01% |
5,165
-702
| -12% | -$80.4K |
2026 Q2
1 quarter
|
|
3384
PUT
CNX Resources
CNX
$5.2B
| $577K | ﹤0.01% |
18,500
+17,300
| +1,442% | +$600K |
2014 Q4
47 quarters
|
|
3385
PUT
APi Group
APG
$18.5B
| $575K | ﹤0.01% |
14,900
+3,700
| +33% | +$149K |
2025 Q3
4 quarters
|
|
3386
PUT
Gen Digital
GEN
$17.6B
| $575K | ﹤0.01% |
26,100
+15,900
| +156% | +$441K |
2025 Q4
3 quarters
|
|
3387
PUT
Solstice Advanced Materials
SOLS
$10.5B
| $574K | ﹤0.01% |
10,200
+5,500
| +117% | +$333K |
2025 Q4
3 quarters
|
|
3388
CALL
Teradata
TDC
$3.12B
| $574K | ﹤0.01% |
19,900
-11,100
| -36% | -$328K |
2016 Q1
42 quarters
|
|
3389
CALL
ClearPoint Neuro
CLPT
$272M
| $574K | ﹤0.01% |
47,000
+34,900
| +288% | +$524K |
2021 Q2
21 quarters
|
|
3390
PUT
Netskope Inc
NTSK
$9.11B
| $574K | ﹤0.01% |
32,900
-71,200
| -68% | -$1.03M |
2025 Q3
4 quarters
|
|
3391
JB Hunt Transport Services
JBHT
$21.2B
| $574K | ﹤0.01% |
2,560
+1,169
| +84% | +$313K |
2025 Q4
3 quarters
|
|
3392
Bending Spoons S.p.A. Ordinary Shares
BSP
$26.7B
| $573K | ﹤0.01% |
+17,205
| New | +$655K |
2026 Q3
0 quarters
|
|
3393
PUT
Magna International
MGA
$16.1B
| $573K | ﹤0.01% |
9,000
+2,500
| +38% | +$167K |
2015 Q1
46 quarters
|
|
3394
PUT
Canadian Imperial Bank of Commerce
CM
$105B
| $573K | ﹤0.01% |
5,200
-26,300
| -83% | -$3.07M |
2026 Q1
2 quarters
|
|
3395
CALL
Upwork
UPWK
$1.24B
| $573K | ﹤0.01% |
70,200
+60,800
| +647% | +$537K |
2018 Q4
31 quarters
|
|
3396
PUT
Vita Coco
COCO
$3.69B
| $573K | ﹤0.01% |
10,000
+5,700
| +133% | +$362K |
2026 Q2
1 quarter
|
|
3397
CALL
Main Street Capital
MAIN
$5.28B
| $573K | ﹤0.01% |
10,400
-5,300
| -34% | -$296K |
2018 Q2
33 quarters
|
|
3398
CALL
AvePoint
AVPT
$3.44B
| $572K | ﹤0.01% |
40,600
+40,000
| +6,667% | +$523K |
2021 Q4
19 quarters
|
|
3399
CALL
VisionWave Holdings
VWAV
$1.8M
| $571K | ﹤0.01% |
129,200
+127,715
| +8,600% | +$4.44M |
2025 Q3
4 quarters
|
|
3400
CALL
KULR Technology Group
KULR
$84.7M
| $571K | ﹤0.01% |
225,700
+40,300
| +22% | +$109K |
2024 Q2
9 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.