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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 | |
|---|---|---|---|---|---|---|---|
2376
Garmin
GRMN
$56.6B
| $1.39M | ﹤0.01% |
4,838
+1,973
| +69% | +$546K |
2026 Q2
1 quarter
|
|
2377
Talen Energy Corp
TLN
$16.5B
| $1.39M | ﹤0.01% |
4,435
+3,363
| +314% | +$1.12M |
2026 Q2
1 quarter
|
|
2378
CALL
Incyte
INCY
$24.9B
| $1.38M | ﹤0.01% |
11,400
-9,400
| -45% | -$1.15M |
2021 Q2
21 quarters
|
|
2379
CALL
Braze
BRZE
$5.28B
| $1.38M | ﹤0.01% |
55,100
-61,200
| -53% | -$1.64M |
2022 Q2
17 quarters
|
|
2380
PUT
VeriSign
VRSN
$28.2B
| $1.38M | ﹤0.01% |
4,900
+4,800
| +4,800% | +$1.36M |
2022 Q1
18 quarters
|
|
2381
CALL
Dave & Buster's
PLAY
$280M
| $1.38M | ﹤0.01% |
216,300
+121,500
| +128% | +$1.14M |
2017 Q4
35 quarters
|
|
2382
CALL
Rexford Industrial Realty
REXR
$8.03B
| $1.38M | ﹤0.01% |
38,000
-38,300
| -50% | -$1.41M |
2024 Q3
8 quarters
|
|
2383
PUT
Steel Dynamics
STLD
$34B
| $1.37M | ﹤0.01% |
6,200
-600
| -9% | -$144K |
2016 Q2
41 quarters
|
|
2384
CALL
Smith & Wesson
SWBI
$710M
| $1.37M | ﹤0.01% |
97,700
+4,400
| +5% | +$62.4K |
2014 Q4
47 quarters
|
|
2385
PUT
Tema ETF Trust Tema Heart & Health ETF
HRTS
$58.3M
| $1.37M | ﹤0.01% |
56,400
-170,900
| -75% | -$6.32M |
2026 Q2
1 quarter
|
|
2386
CALL
Brown-Forman Class B
BF.B
$13.8B
| $1.37M | ﹤0.01% |
52,200
+500
| +1% | +$13.5K |
2022 Q4
15 quarters
|
|
2387
Protolabs
PRLB
$1.65B
| $1.37M | ﹤0.01% |
14,440
+14,264
| +8,105% | +$1.17M |
2026 Q1
2 quarters
|
|
2388
CDW
CDW
$21.6B
| $1.37M | ﹤0.01% |
+10,672
| New | +$1.5M |
2026 Q3
0 quarters
|
|
2389
PUT
CoStar Group
CSGP
$12.2B
| $1.36M | ﹤0.01% |
49,700
+36,600
| +279% | +$1.1M |
2021 Q2
21 quarters
|
|
2390
PUT
Teladoc Health
TDOC
$1.63B
| $1.36M | ﹤0.01% |
234,700
-128,800
| -35% | -$942K |
2017 Q3
36 quarters
|
|
2391
SELLAS Life Sciences
SLS
$1.7B
| $1.36M | ﹤0.01% |
110,563
-43,536
| -28% | -$545K |
2026 Q1
2 quarters
|
|
2392
PUT
Banco Bradesco
BBD
$28.7B
| $1.36M | ﹤0.01% |
386,400
-3,100
| -0.8% | -$10.6K |
2015 Q1
46 quarters
|
|
2393
PUT
Mattel
MAT
$4.59B
| $1.36M | ﹤0.01% |
107,300
+67,800
| +172% | +$962K |
2014 Q4
47 quarters
|
|
2394
Zions Bancorporation
ZION
$9.6B
| $1.36M | ﹤0.01% |
+21,674
| New | +$1.49M |
2026 Q3
0 quarters
|
|
2395
PUT
JBS N.V.
JBS
$13.3B
| $1.36M | ﹤0.01% |
120,200
+10,900
| +10% | +$139K |
2025 Q2
5 quarters
|
|
2396
CALL
Kodiak Gas Services
KGS
$4.43B
| $1.36M | ﹤0.01% |
25,600
+15,800
| +161% | +$965K |
2024 Q1
10 quarters
|
|
2397
PUT
Leverage Shares 2X Long CRCL Daily ETF
CRCG
$75.4M
| $1.35M | ﹤0.01% |
106,100
-5,100
| -5% | -$60.5K |
2025 Q3
4 quarters
|
|
2398
CALL
M&T Bank
MTB
$31.6B
| $1.35M | ﹤0.01% |
6,200
+3,800
| +158% | +$914K |
2014 Q4
47 quarters
|
|
2399
CALL
Bentley Systems
BSY
$13.4B
| $1.35M | ﹤0.01% |
42,200
+22,000
| +109% | +$741K |
2022 Q2
17 quarters
|
|
2400
CALL
Cogent Biosciences
COGT
$5.12B
| $1.35M | ﹤0.01% |
42,100
-19,000
| -31% | -$702K |
2022 Q1
18 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.