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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 | |
|---|---|---|---|---|---|---|---|
4476
CALL
Osisko Gold Group
OGG
$714M
| $228K | ﹤0.01% |
+80,900
| New | +$216K |
2026 Q3
0 quarters
|
|
4477
PUT
Kingsoft Cloud Holdings
KC
$2.26B
| $228K | ﹤0.01% |
25,000
-6,500
| -21% | -$67.7K |
2020 Q3
24 quarters
|
|
4478
State Street SPDR S&P Kensho Final Frontiers ETF
ROKT
$147M
| $228K | ﹤0.01% |
2,190
+1,685
| +334% | +$188K |
2026 Q2
1 quarter
|
|
4479
PUT
WaterBridge Infrastructure LLC
WBI
$1.53B
| $228K | ﹤0.01% |
8,100
-5,600
| -41% | -$181K |
2026 Q1
2 quarters
|
|
4480
Edgewise Therapeutics
EWTX
$5.03B
| $228K | ﹤0.01% |
+5,610
| New | +$238K |
2026 Q3
0 quarters
|
|
4481
PUT
Procore
PCOR
$11.6B
| $228K | ﹤0.01% |
4,400
| – | – |
2022 Q4
15 quarters
|
|
4482
PUT
Aeva Technologies
AEVA
$740M
| $227K | ﹤0.01% |
16,200
+7,800
| +93% | +$141K |
2020 Q4
23 quarters
|
|
4483
PUT
WPP
WPP
$5.99B
| $227K | ﹤0.01% |
9,200
+7,200
| +360% | +$167K |
2023 Q3
12 quarters
|
|
4484
Belden
BDC
$3.98B
| $227K | ﹤0.01% |
2,103
-7,537
| -78% | -$873K |
2026 Q1
2 quarters
|
|
4485
CALL
Armstrong World Industries
AWI
$7.35B
| $227K | ﹤0.01% |
+1,400
| New | +$235K |
2026 Q3
0 quarters
|
|
4486
PUT
Schrodinger
SDGR
$2.22B
| $227K | ﹤0.01% |
7,300
+1,500
| +26% | +$29.6K |
2021 Q1
22 quarters
|
|
4487
CALL
Hexcel
HXL
$6.02B
| $227K | ﹤0.01% |
2,700
+2,300
| +575% | +$224K |
2023 Q1
14 quarters
|
|
4488
Hyatt Hotels
H
$17.5B
| $227K | ﹤0.01% |
1,429
+1,250
| +698% | +$219K |
2026 Q2
1 quarter
|
|
4489
Ryman Hospitality Properties
RHP
$9.32B
| $226K | ﹤0.01% |
1,891
-53
| -3% | -$6.67K |
2026 Q2
1 quarter
|
|
4490
PUT
AMN Healthcare
AMN
$1.47B
| $226K | ﹤0.01% |
6,300
-2,200
| -26% | -$74.8K |
2015 Q3
44 quarters
|
|
4491
PUT
indie Semiconductor
INDI
$512M
| $226K | ﹤0.01% |
77,200
+29,500
| +62% | +$109K |
2021 Q2
21 quarters
|
|
4492
CALL
Healthpeak Properties
DOC
$13.8B
| $226K | ﹤0.01% |
11,300
+1,400
| +14% | +$29.7K |
2025 Q1
6 quarters
|
|
4493
PUT
Vizsla Silver
VZLA
$1.09B
| $226K | ﹤0.01% |
59,500
-2,700
| -4% | -$9.8K |
2025 Q3
4 quarters
|
|
4494
CALL
Signet Jewelers
SIG
$4.37B
| $225K | ﹤0.01% |
2,200
-3,100
| -58% | -$283K |
2015 Q4
43 quarters
|
|
4495
CALL
United Bankshares
UBSI
$6.48B
| $225K | ﹤0.01% |
4,900
+700
| +17% | +$33.2K |
2026 Q1
2 quarters
|
|
4496
LTC Properties
LTC
$2.43B
| $225K | ﹤0.01% |
5,250
+855
| +19% | +$35K |
2026 Q2
1 quarter
|
|
4497
CALL
Fortive
FTV
$20.2B
| $225K | ﹤0.01% |
4,100
-5,100
| -55% | -$302K |
2017 Q1
38 quarters
|
|
4498
CALL
Crane Co
CR
$12.1B
| $224K | ﹤0.01% |
1,100
-1,100
| -50% | -$233K |
2026 Q2
1 quarter
|
|
4499
PUT
Moelis & Co
MC
$4.14B
| $224K | ﹤0.01% |
3,900
+3,300
| +550% | +$217K |
2026 Q1
2 quarters
|
|
4500
Red Robin
RRGB
$167M
| $224K | ﹤0.01% |
29,624
-11,533
| -28% | -$92.3K |
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.