We are live on !
Find out more
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 | |
|---|---|---|---|---|---|---|---|
426
PUT
CleanSpark
CLSK
$1.65B
| $22.4M | 0.01% |
1,738,200
+804,900
| +86% | +$10.5M |
2020 Q3
24 quarters
|
|
427
PUT
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$25.1M
| $22.4M | 0.01% |
785,200
-3,031,800
| -79% | -$46.9M |
2025 Q3
4 quarters
|
|
428
CALL
MP Materials
MP
$6.42B
| $22.2M | 0.01% |
468,600
+12,200
| +3% | +$619K |
2020 Q3
24 quarters
|
|
429
CALL
General Motors
GM
$75.6B
| $22.1M | 0.01% |
287,600
+124,200
| +76% | +$10.4M |
2014 Q4
47 quarters
|
|
430
PUT
BP
BP
$115B
| $22.1M | 0.01% |
501,800
+177,200
| +55% | +$7.6M |
2021 Q2
21 quarters
|
|
431
PUT
Charter Communications
CHTR
$15.2B
| $22.1M | 0.01% |
198,900
+77,300
| +64% | +$10.8M |
2026 Q1
2 quarters
|
|
432
CALL
DraftKings
DKNG
$9.5B
| $22M | 0.01% |
1,157,200
+98,200
| +9% | +$2.37M |
2020 Q1
26 quarters
|
|
433
CALL
Kinder Morgan
KMI
$69.7B
| $22M | 0.01% |
729,000
+293,500
| +67% | +$9.31M |
2021 Q2
21 quarters
|
|
434
CALL
Bristol-Myers Squibb
BMY
$128B
| $21.9M | 0.01% |
351,400
-102,800
| -23% | -$6.5M |
2014 Q4
47 quarters
|
|
435
CALL
Synopsys
SNPS
$88B
| $21.9M | 0.01% |
50,300
+17,200
| +52% | +$7.01M |
2016 Q3
40 quarters
|
|
436
CALL
Eaton
ETN
$137B
| $21.8M | 0.01% |
50,700
-4,900
| -9% | -$2.04M |
2021 Q2
21 quarters
|
|
437
CALL
Vale
VALE
$49.5B
| $21.7M | 0.01% |
1,620,200
-248,900
| -13% | -$3.62M |
2018 Q1
34 quarters
|
|
438
CALL
Oklo
OKLO
$4.89B
| $21.7M | 0.01% |
586,300
+10,900
| +2% | +$460K |
2024 Q1
10 quarters
|
|
439
PUT
Cerebras Systems
CBRS
$21.7B
| $21.5M | 0.01% |
121,000
+43,100
| +55% | +$8.67M |
2026 Q2
1 quarter
|
|
440
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$139M
| $21.4M | 0.01% |
1,217,000
+822,700
| +209% | +$16.3M |
2021 Q2
21 quarters
|
|
441
CALL
Blackstone
BX
$96.9B
| $21.4M | 0.01% |
191,100
-20,800
| -10% | -$2.72M |
2014 Q4
47 quarters
|
|
442
CALL
Humana
HUM
$52.4B
| $21.4M | 0.01% |
56,000
+29,900
| +115% | +$11.6M |
2014 Q4
47 quarters
|
|
443
CALL
Vodafone
VOD
$35.9B
| $21.3M | 0.01% |
1,320,200
-118,500
| -8% | -$1.88M |
2014 Q4
47 quarters
|
|
444
CALL
United Airlines
UAL
$38.9B
| $21.3M | 0.01% |
192,100
+20,900
| +12% | +$2.46M |
2014 Q4
47 quarters
|
|
445
CALL
Riot Platforms
RIOT
$6.69B
| $21.3M | 0.01% |
1,056,300
+440,400
| +72% | +$9.27M |
2020 Q4
23 quarters
|
|
|
446
PUT
General Motors
GM
$75.6B
| $21.2M | 0.01% |
274,700
+55,100
| +25% | +$4.61M |
2014 Q4
47 quarters
|
|
447
CALL
Dow Inc
DOW
$22.6B
| $21M | 0.01% |
762,300
+141,400
| +23% | +$4.21M |
2019 Q2
29 quarters
|
|
|
448
PUT
Oklo
OKLO
$4.89B
| $20.9M | 0.01% |
565,500
+147,700
| +35% | +$6.24M |
2024 Q2
9 quarters
|
|
449
PUT
Fortinet
FTNT
$90.4B
| $20.9M | 0.01% |
117,000
-81,900
| -41% | -$13.3M |
2015 Q3
44 quarters
|
|
450
PUT
Centene
CNC
$34.5B
| $20.9M | 0.01% |
336,400
+195,700
| +139% | +$12.8M |
2021 Q1
22 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.