Jane Street’s Comfort Systems FIX Stock Holding History

Jane Street’s Portfolio FIX Stock Details FIX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q3	$371M	Buy	224,300 +110,200	+97%	+$185M	0.03%	349
2026 Q2	$226M	Sell	114,100 -37,200	-25%	-$67.5M	0.02%	528
2026 Q1	$209M	Buy	151,300 +113,100	+296%	+$144M	0.03%	389
2025 Q4	$35.7M	Buy	38,200 +26,600	+229%	+$24.6M	0.01%	1136
2025 Q3	$9.6M	Buy	11,600 +5,900	+104%	+$4M	﹤0.01%	2482
2025 Q2	$3.06M	Buy	5,700 +700	+14%	+$305K	﹤0.01%	3721
2025 Q1	$1.61M	Buy	5,000 +3,400	+213%	+$1.37M	﹤0.01%	4719
2024 Q4	$678K	Sell	1,600 -500	-24%	-$220K	﹤0.01%	6120
2024 Q3	$820K	Sell	2,100 -100	-5%	-$32.9K	﹤0.01%	6266
2024 Q2	$669K	Sell	2,200 -5,000	-69%	-$1.59M	﹤0.01%	6543
2024 Q1	$2.29M	Buy	7,200 +800	+13%	+$204K	﹤0.01%	3889
2023 Q4	$1.32M	Buy	6,400 +5,200	+433%	+$961K	﹤0.01%	5080
2023 Q3	$204K	Buy	+1,200	New	+$211K	﹤0.01%	7593

Other funds holding FIX

Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return

State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

JP Morgan Chase New York $1.84T AUM 33.86% 1-Year Est. Return

Capital World Investors Los Angeles, California $824B AUM 37.44% 1-Year Est. Return

Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return

Federated Hermes Pittsburgh, Pennsylvania $71.4B AUM 33.43% 1-Year Est. Return

Amundi Paris, France $496B AUM 35.36% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return

Massachusetts Financial Services Boston, Massachusetts $296B AUM 23.14% 1-Year Est. Return

Jane Street's FIX Position: Q3 2026 in Review

Jane Street increased its Comfort Systems (FIX) stake by 132% in Q3 2026, buying an estimated $6.97M and bringing the position to 7,286 shares worth $12.1M. The position accounts for ﹤0.01% of the portfolio, ranked #2607.

Jane Street first reported a position in FIX in Q2 2013 and has held it in 29 quarters since. The position peaked at $80.4M in Q2 2024. 930 funds tracked by Wall St. Rank hold FIX as of Q3 2026.

Jane Street held 7,286 shares of Comfort Systems worth $12.1M as of Q3 2026.
Jane Street bought 4,150 Comfort Systems shares in Q3 2026, an estimated $6.97M.
Comfort Systems made up ﹤0.01% of Jane Street's portfolio in Q3 2026, its #2607 holding.
Jane Street first reported a position in Comfort Systems in Q2 2013 and has held it in 29 quarters since.
Jane Street's Comfort Systems position peaked at $80.4M in Q2 2024.
930 funds tracked by Wall St. Rank held Comfort Systems as of Q3 2026.

Based on Jane Street's 13F filing for Q3 2026, filed 12 Nov 2026.